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The prevalence of malnutrition generally tends to be greater among adults with increasing age [20]. The main source of histamine in inflamed skin is the dermal mast cell, supplemented by infiltrating basophil leucocytes. These concerns have been contested but guidelines for treatment now reflect an increased caution in the prescribing of antidepressants. There is no conclusive evidence to date that morphoea is caused by Borrelia infection. Patients with manganese deficiency may present with nausea, vomiting and weight loss. In the milder forms, blistering may not always result from minor friction and may only follow sharp knocks to the skin. Age Hypotrichosis, bulboid nose and short fingers may be obvious very early after birth depending on the severity of the phenotype. Part 5: Metabolic & NutritioNal Ethnicity the role of ethnicity is confounded by socioeconomic factors. Carbamazepine is licensed for the prophylaxis of bipolar disorder, and is also used in augmentation strategies for refractory depression. Molecular genetic studies to identify the origin of the T lymphocytes in the blood (maternal or autologous) will differentiate between Omenn syndrome and graftversushost reaction. The patient often describes the sudden appearance of complete lesions with little or no prodrome. Investigations Initial investigations should include a full lipid profile, fasting glucose, urine and electrolytes, liver function tests and thyroid stimulating hormone levels. Pyoderma gangrenosum: a retrospective review of patient characteristics, comorbidities and therapy in 103 patients. Pathophysiology Calcium deposits will stain blue with H&E and black with von Kossa stain. Behavioural and psychodynamic techniques are used in group and individual settings. Similar changes are not infrequently seen around seborrhoeic keratoses [7] and other elevated skin lesions [8] and are termed the Meyerson phenomenon. Even if a relevant allergen is identified, it may be difficult to avoid all contact with the hands for allergens such as nickel and fragrance. It is thought to be related to stimulation of the cholinergic postganglionic sympathetic nerve supply to the sweat glands. They are usually present in childhood in homozygotes and become more common with age in untreated heterozygotes. In sum, there is no strictly uniform histology but a constellation of different histological features [11]. Symmetrical lesions may suggest secondary lichenification from a contact dermatitis. Associated diseases Acquired pernicious anaemia is an autoimmune gastritis characterized by destruction of gastric parietal cells and loss of intrinsic factor. Contact sensitivity, for example to toothpaste ingredients, can occasionally be demonstrated. Disease course and prognosis Pseudoxanthoma elasticum causes considerable morbidity and only occasional mortality [3,60]. Those with marasmus tend to show loss of subcutaneous fat which may result in a wizened or prematurely aged appearance when the buccal fat pads are affected. In a review of 27 cases, which included only one male, the mean age at presentation was 10. There have been occasional reports of associations with cancer, namely breast carcinoma [87], meningioma [88], hepatocellular carcinoma [89], Hodgkin disease [90], lung cancer [91], prostate cancer [92] and squamous carcinoma of the head and neck [93]. There is a high risk of leukaemia and other malignancies in these children, probably due to the structural instability of chromosomes observed in Fanconi anaemia, which leads to a high frequency of chromosomal breaks and rearrangements. Other solid tumours such as liver, breast, lung, gastric, laryngeal, prostate and cervical carcinoma are anecdotally reported to lead to localized or generalized pruritus [192,193].

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Complications and comorbidities There are no significant longterm complications of urticaria. By virtue of the number of body sites involved, this subtype meets the classification criteria for generalized morphoea, but it is a clinically distinct condition. Secondary dyslipidaemia due to chronic cholestasis It has already been noted that xanthelasmas can be a feature of chronic cholestasis. It is most often seen in infants with mastocytomas and diffuse cutaneous mastocytosis due to intense subepidermal oedema resulting from mast cell degranulation. Differential diagnosis Diseases with localized areas of hyperkeratosis are considered in the differential diagnosis, as listed in Box 87. Damage to adjacent preganglionic parasympathetic fibres and postganglionic sympathetic fibres may result in parasympathetic fibres regrowing into the sympathetic nerves, thereby directly controlling sweat gland function. Investigations Serum copper and caeruloplasmin concentrations are generally low, with raised 24 h urine copper excretion (particularly after a dose of penicillamine) and raised liver copper. As patients experience sensory loss, trauma to the affected site often goes unnoticed, and progressively worsens as the area is continuously subjected to repetitive pressure and shear forces. Restriction to limited cosmetically sensitive areas, such as the forearms and lower legs, will minimize the risk of significant adrenocortical suppression. Clinical features and pathology Callosities or more extensive thickening of plantar epidermis commonly accompanies obesity and occurs with increasing age or orthopaedic problems [2]. Gastrointestinal symptoms occur in about 50% of patients but are usually mild with anorexia, nausea and vomiting being the most frequent. Pleurisy and pericarditis have a prevalence of 17% at disease onset and a cumulative incidence of 36% [214]. Prelymphomatous eruption i Bizarre or angulated shape Fine scale May be irritable Progresses to cutaneous lymphoma Histology Absence of epidermal eczema Dermal infiltrate May be eczematous changes Little or no dermal infiltrate Chronic superficial scaly dermatitis u Regular, round or oval shape Coarser scale Little or no irritation Does not become malignant Management Response to treatment is often disappointing, mainly because the pigmentation takes a long time to recover. Urticarial reactions may not be to the main food itself but to other ingredients, such as seeds or spices. Investigations In patients with mast cell activationinduced angiooedema, spontaneous and inducible forms should be considered. Introduction and general description In 1976, Hay and Wells described a syndrome inherited in an autosomal dominant fashion with ankyloblepharon, ectodermal defects and clefting of the lip and palate [1]. Role of topical calcineurin inhibitors in the treatment of seborrhoeic dermatitis: a review of pathophysiology, safety and efficacy. Common variable immunodeficiency Common variable immunodeficiency is defined by low total concentrations of IgG as well as low IgA and/or IgM. Noncutaneous features are dominated by hamartomatous polyps, which may occur in any part of the gastrointestinal tract but more consistently in the jejunum. Skin grafting may also help, although the extent of the erosions and underlying tissue fragility, in combination with the poor prognosis, may influence what is clinically feasible [1]. Clinically the syn drome is characterized by cutaneous, skeletal, dental, ocular and soft tissue defects. For several of the familial forms, a paradominant inheritance has been established, with a combination of a germinal mutation and a local somatic second hit, whereas somatic/mosaic genetic defects cause the more common sporadic vascular malformations. The scalp hair and eyebrows are long and sparse, the extremities are thin and the hands are large with long fingers and atrophic nails. Neurological damage Approximately 50% of those with diabetes develop a chronic, symmetrical, lengthdependent sensorimotor polyneuropathy [21], probably due to damaged endoneurial microvessels. Cardiac investigation to assess cardiac status is important, and in an atrisk pregnancy screening with cardiac ultrasound should begin during the pregnancy. Mutation analysis of five new patients affected by prolidase deficiency; the lack of enzyme activity causes necrosislike cell death in cultured fibroblasts. Protection from phototoxic injury during surgery and endoscopy in erythropoietic protoporphyria. Other mucosal surfaces may be involved, including the conjunctiva, nasopharynx, larynx, oesophagus [53], urethra, vulva and cervix [54].

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The effect of retinoids is unknown and the need for treatment diminishes with age. Less consistent associations have been documented with the other genes Part 4: Inflammatory 56. The disease persists throughout life and is often accompanied by significant atopic manifestations. Nodular prurigo can quite frequently complicate the atopic diathesis (Chapter 83). Besides melanin, haemoglobin (in both the oxygenated and reduced state) and carotenoids both contribute significantly to skin colour. Immunophenotyping of the lymphoid infiltrate may not solve the problem as it generally shows features of mature T cells in both benign and malignant erythroderma [23]. Some authors have attributed the cause of leg ulceration to venous insufficiency, others have implicated increased activity of plasminogen activator inhibitor 1 [20]. However, it can be very difficult convincing a patient that he/she should stop taking. A patient will often ascribe the onset to an event or change in life that is quite trivial, for example the installation of central heating or a particularly cold, dry winter [7]. Oculocerebral syndrome with hypopigmentation (Cross syndrome/ Kramer syndrome) the disorder was initially described in an inbred Amish family and is characterized by generalized hypopigmentation with white/silvery hair, severe mental retardation with spastic tetraplegia and athetosis [1]. Porphyria is not related to any chronic psychiatric disease, except generalized anxiety. In general, hypervitaminosis A results from overconsumption of nonprescription nutritional supplements, prescription medications containing vitamin A derivatives [15] and foods high in vitamin A. Aspirin and other nonsteroidal antiinflammatory drugs have been reported to ameliorate prostaglandinmediated flushing in some patients, but must be introduced with caution, under cover of antihistamines and with initial observation, if there is any history of intolerance. The scalp hair, eyebrows and eyelashes were fine and sparse and some nails were dystrophic. Differential diagnosis In clinical practice, it may sometimes be difficult to differentiate lesions of urticarial vasculitis from urticaria when some of the characteristic histopathological features of vasculitis are not present in the skin biopsy [36]. Flexural, oozing, verrucous plaques mimicking pemphigus vegetans have been described in a child [83]. Tumor necrosis factor receptor associated periodic syndrome: a novel syndrome with cutaneous manifestations. The skin is a critical mechanical barrier, and a vital component of the innate immune system and the site where many innate and adaptive immune responses to infection are seen. Adult manifestations include the development of tumours, a sleep disorder with severe insomnia (agrypnia excitata) and cognitive decline [4]. Such episodes may present as a severe systemic illness with high fever and a widespread eruption. Homogeneous staining was present in 46 cases, speckled staining in 18 and nucleolar staining in five. Associated features include osteoporosis [7] and taurodontism (vertical enlargement of the molar pulp chamber) [8]. The disease manifests with the formation of often large, calcified masses located mainly over the large joints [73]. Development and initial validation of the localized scleroderma skin damage index and physician global assessment of disease damage: a proofofconcept study. Topical corticosteroids may be used in combination with antifungals for their additional antiinflammatory effects, with improved results compared with antifungal monotherapy [79]. The rete ridges are filiform and anastomizing and the basal layer appears hyperpigmented.

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It is rare but its importance is that morbidity is high with chronicity and severe complications, which can lead to death. Accordingly, patients may present with excoriations, papules, nodules, lichenification, scars, and hyper and hypopigmentation resulting from scratching. A simple clinical scoring system, based on an assessment of joint hypermobility, skin extensibility and bruising might be useful in predicting which members of the general population are likely to produce poor scars following cutaneous surgery [39]. It is also hepatotoxic, particularly to bile canaliculi, and severe liver damage occurs in around 1% of patients. Most commonly (in approxi mately 85% of cases), this is a single isolated lesion near the ver tex of the scalp. Cutaneous features include cutis laxa of the neck, hypertrichosis of the forehead and back, and capillary haemangiomas. In some cases this is an acute inflammatory eruption accompanied by oedema; more typically the facial dermatosis begins insidiously and extends over a few weeks. Pathology Histology shows intraepithelial and/or subepithelial abscesses containing large numbers of eosinophils [2]. There is a suggestion that the delays in making a diagnosis may be greater in adults than in children and greater in patients with plaque or generalized morphoea rather than linear disease [34]. Pathology [9] In place of the normal gonads, ovarian streaks are present that are composed of stromalike cells and quiescent germinal epithelium without follicular activity or germ cells. Chronic, recurrent vesiculation without periods of remission may be termed chronic vesicular dermatitis. Larger papules with a mosaic pattern and acral distribution have been diagnosed as mosaic acral keratosis (see also Focal acral hyperkeratosis earlier) [8]. Prenatal detection of these tumours is now possible by fetal echocardiography [58,59] and is often the initial clue to the diagnosis. Causative organisms this is not applicable, except for secondary bacterial infection. Brie), fromage frais, Gouda (small amounts) Fresh meat without seasoning, organic eggs Not allowed All others. Enzyme replacement therapy is being developed for mannosidosis and bone marrow transplantation may improve the neurological outcome in fucosidosis. Ulcer healing is inhibited by both venous eczema and stasis dermatitis, in part due to chronic lower leg swelling. The subcutaneous tissue is also involved with fat being replaced by coarse collagen fibres. Central heating should be humidified where possible, and abrupt temperature changes should be avoided. History Acrodermatitis enteropathica manifests as breastfeeding infants are weaned from the breast, or between the fourth and tenth Part 5: Metabolic & NutritioNal 63. Some mothers carry mutations in mammary gland zinc transporters, thus reducing the amount of zinc secreted into breast milk and predisposing infants to zinc deficiency while they are still being breastfed. Acute bleeding is treated with fresh frozen plasma in order to correct deficient coagulation factors. Presentation this rare progeroid syndrome is characterized by low birth weight, short stature and moderate mental retardation, associated with multiple pigmented naevi and a distinctive birdlike facies with microcephaly [2,3]. Physicians should be alert to the subtle eruption of erythema marginatum and the importance of diagnosing rheumatic fever. Disease onset is typically in early life (see Epidemiology), 60% in the first year and 85% before the age of 5 [16] and typically affects both sexes equally. They are found predominantly around the hairline, forehead, preauricular cheek and chin areas.

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Nummular dermatitis can also occur on a background of asteatotic eczema, although the relationship between the two conditions is uncertain. Furthermore, the incidence of gastric bleeding and retinal complications, at <1%, is lower than previously thought [49]. For smaller lesions, potent topical corticosteroids [85], intralesional corticosteroids [85] and topical tacrolimus [86,87] can be used. The pain is accompanied by autonomic instability and its intensity is exacerbated by physical and emotional stress and alleviated by relaxation. Familial tumoral calcinosis: from characterization of a rare phenotype to the pathogenesis of ectopic calcification. Management Any underlying venous hypertension and/or pedal oedema should be controlled. Somatic secondhit could explain the intrafamilial clinical variability and the multifocality of the lesions [10]. Patients with frequent attacks and/or longstanding disease should be checked for underlying causes. Often treatment with proton pump inhibitors is very effective, thus a careful history is required. Pathophysiology Predisposing factors Infants and women of childbearing age are at greatest risk for iron deficiency. Ro and La autoantigens are expressed within the apoptotic blebs and stimulate autoantibody production by B cells [8]. Successful management of urticarial Age Urticarial vasculitis occurs with peak incidence in the fourth decade of life [9,10]. It clears with effective anticancer treatment and can be an early marker of subsequent recurrence. Gingivitis, ulcerative stomatitis and periodontitis are common and severe, leading to loss of teeth. Agents such as hydroxyzine, promethazine or trimeprazine given 1 h before bedtime can be useful when there is severe nocturnal itching. However, this condition may be difficult to distinguish from pityriasis alba when it occurs on the face and in cases of later onset. Differential diagnosis Cockayne syndrome patients exhibit similar facial features, short stature and mental retardation. Zincprotoporphyrin is also increased in iron deficiency, lead poisoning and certain anaemias. Acute urticarial reactions from drugs are common, usually occurring within hours of drug administration in presensitized patients although it should be noted that urticarial drug reactions. Many patients have installed in their private homes a steam bath and benefit from daily steam bathing. In addition, no neuropathy can be demonstrated in the trigeminal nerve pathway and the lesions are often bilateral. Although still unproven, there may be a role for sentinel node biopsy in the management of these patients. A multidisciplinary approach is required with involvement of appropriate specialists. Normally both statins and fibrates work well, both in improving the lipid profile and in causing regression of the palmar and tuberous xanthomas [8,9]. Headaches, fever, malaise, hypertension with associated Part 4: Inflammatory retinopathy and encephalopathy, pulmonary oedema and acute renal failure may develop suddenly. Between the ages of 5 and 13 years, the nails become dystrophic and are shed: they may be reduced to horny plugs or be completely destroyed. Epidemiology Cutaneous focal mucinosis occurs in adults of either sex but it has also been reported in children [1]. The diagnosis in many cases is made only by considering the condition in a patient with an obscure illness.

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Folate deficiency is a major cause of open dysraphism, largely preventable by folate supplementation before conception and during early pregnancy [7]. Individuals with limited diets, including alcoholics, anorexics and the elderly, may be at risk for vitamin K deficiency. The benefit disappeared at the end of the study suggesting that, as in dermatomyositis and scleromyxoedema, maintenance therapy may be required. The psychosocial effects of chronic and disfiguring skin disease often produce feelings of stigma and rejection. Three patients had a partial response with a reduction of muscle disease; the dermatosis did not improve. The patient had noticed progressive changes in facial contours for over 5 years before a diagnosis was reached. Subsequent processing creates several inhibitors with different target specificities [7,8]. Indirect tests, such as a tryptophan load test or measurement of erythrocyte aminotransferase activity, may be useful [93]. Rheumatologists, in contrast, prescribed methotrexate in 34% and systemic corticosteroids in 31% of cases, and topical treatments in 10% and phototherapy in only 2% [34]. The suspected diagnosis of amyloidosis may be the starting point for a multidisciplinary treatment approach as different organs may be involved [116]. Clinical features History Vitamin B9 Deficiency Definition and nomenclature Vitamin B9 (folate) is a watersoluble Bcomplex vitamin and important coenzyme for amino acid, purine and pyrimidine metabolism. Investigations Low serum copper and caeruloplasmin concentrations are only diagnostic after 3 months of age; low levels can be found in normal babies below this age. Simple measures such as turning down the central heating, not heating the bedroom, avoiding contact of wool with the skin and wearing cotton clothing may also make life more comfortable. In contrast to apolipoprotein A1 amyloidosis, cystatin C amyloidosis is clinically asymptomatic with no skin signs, but histology may show typical amyloid deposition. In a multicentre worldwide study of 750 children, concomitant autoimmune disease was identified in 1. Similarly, central sensitization is based on spontaneous activity of superficial dorsal horn neurons, enhancement of mechanically evoked responses and their increased response to mediators [33]. Factors that may precipitate an acute attack [1] the most common precipitants are drugs and the menstrual cycle, with recurrent attacks often occurring in the late luteal phase. This encompasses a wide range of clinical and histological phenotypes, which can occur as isolated cutaneous lesions or in association with extracutane ous features as part of diverse syndromes. A dermatologist may be the first physician to see such patients, and should be aware of possible associations with underlying neurological abnormalities. The term describes the situation of an individual who is disqualified from full social acceptance. Age the disease manifests at birth with thick and kinky or curly hair on the scalp. Colonization of the skin by these bacteria may exacerbate the dermatitis, although S. Pathophysiology the pathology and natural history of the polyposis are essentially similar to familial polyposis coli. Epidermolytic palmoplantar keratoderma with woolly hair and dilated cardiomyopathy.

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The Caucasian peoples of Europe exhibit a light brown colour that can be enhanced by exposure to sunlight. This may also be considered a marker of disease severity since it is closely associated with quality of life scores and psychological morbidity. Sex There is insufficient evidence to comment on whether gender affects the likelihood of asteatotic eczema. Patients suffer from organ abscesses with staphylococci or fungi in the spleen, liver and lung, as well as lymph node abscesses. It should be noted that the classification criteria are not diagnostic, although operationally they may be used as such. There should be a systematic approach to assess risk and/or confirm diagnosis of specific complications such as pulmonary hypertension. Early symptoms included irritability, lethargy, vomiting, diarrhoea and developmental delay. The other monogenic autoinflammatory syndromes are even rarer and some have so far been described only in a few families. Vibratory angiooedema Vibratory urticaria is a very rare form of urticaria, which was first described in its familial form [91]. Pemphiguslike circulating intercellular antibodies have been reported in conditions such as thermal burns [105], toxic epidermal necrolysis [106] and in firstdegree relatives of relatives of pemphigus patients [107,108]. Itching and flushing can be controlled by antihistamines in many patients, but can be refractory to treatment. Scalp erosions and chronic scalp infections may be severe enough to warrant surgical intervention with skin grafting [9]. No reliable data has been published but the prevalence at birth is estimated at around 1/1000 000. Comorbid affective disease is common, as is suicidal ideation (up to 25% of patients will act on their suicidal ideation) [1]. They are usually located on the head and neck, but can also be seen on the trunk or limbs. Associated diseases Iron deficiency is seen in approximately 17% of children with cystic fibrosis [3]. Additionally, patients with dermatitis herpetiformis have increased risk of type 1 diabetes [20], Addison disease [21] and vitiligo [18]. The dermis is atrophic, with sparse thin collagen bundles, but there is abundant elastin, which appears clumped due to the deficiency of collagen [3,4]. A latephase response comprising erythema and a deeper oedematous reaction occurs between 6 and 24 h, and there is a delayed response at 48 h. Clinical features Neutral lipid storage disease with ichthyosis is a multisystem disorder, but clinical features are variable [8,9]. Associated diseases Niacin deficiency can be associated with carcinoid syndrome, where excess conversion of tryptophan to serotonin by carcinoid tumours leads to depletion of tryptophan stores and insufficient niacin synthesis [78,79]. It is more common in patients who do not rotate the site of injection of insulin and can lead to impaired insulin absorption and poorer diabetic control. Clinical examination and then appropriate neurological investigations should be performed as indicated. Mutations have been identified in a subset of patients only, suggesting genetic heterogeneity. Bloom syndrome occurs with greater frequency in Ashkenazi Jews, accounting for approximately onethird of all cases. Nodular lesions may follow, and these frequently break down to form necrotic ulcers.