Urticarial exanthema due to hepatitis B in a pregnant woman, mimicking a polymorphic eruption of pregnancy.

Hepatitis B virus (HBV) infection in pregnant women is very rare in western countries, thus, cutaneous manifestation of HBV infection may be confused with a dermatosis specific of pregnancy. We report a 39-year-old woman who presented in her 20th week of pregnancy with a pruritic rash, which consisted of generalized erythematous plaques, some of them with a purple centre. Serology testing showed acute HBV infection, and a biopsy revealed a superficial and interstitial perivascular inflammatory infiltrate of lymphocytes and eosinophils. A diagnosis of exanthema due to acute hepatitis B infection was established. The patient delivered a clinically healthy boy, who was given the first dose of the HBV vaccine and intravenous specific immunoglobulin, followed by the second dose 2 months later, and did not get infected with HBV. To our knowledge, this is the first case describing HBV exanthema in a pregnant woman, which led to early action for the newborn, avoiding vertical transmission and its high prevalence of cirrhosis and hepatocellular carcinoma.

Congenital cutaneous Langerhans cell histiocytosis and cutaneous mastocytoma in a child.

Langerhans cell histiocytosis and mastocytoma are clonal disorders of bone-marrow-derived cells, most commonly seen in the pediatric age. Infiltration of mast cells and Langerhans cells in the same lesion has been published before, but, to our knowledge, this is the first time that the occurrence of two mastocytomas and Langerhans cell histiocytosis is reported. It could be hypothesized that both clonal disorders of bone-marrow-derived cells could have a common origin.

Hidradenitis palmoplantar idiopática: ¿es siempre necesaria la biopsia? / Idiopathic palmoplantar hidradenitis: is biopsy always necessary?

La hidradenitis palmoplantar idiopática (HPPI) es una dermatosis neutrofílica que cursa con placas eritematoso-edematosas en las plantas de los pies y, en ocasiones, en las palmas de las manos. Estas lesiones se presentan en niños sin antecedentes de medicación ni manifestaciones sistémicas. Se postula que determinados factores mecánicos afectarían a las glándulas ecrinas inmaduras. El tratamiento es controvertido, aunque se ha observado que se puede manejar de forma conservadora. Por otro lado, el diagnóstico histológico, que presenta hallazgos típicos, no sería necesario realizarlo en todos los casos, puesto que la mayoría presenta una clínica característica con resolución espontánea en menos de 3 semanas. Presentamos dos casos de HPPI en niños (AU)

Idiopathic palmoplantar hidradenitis (IPPH) is a neutrophilic dermatosis that causes erythematous plaques in plants and sometimes in palms. These injuries occur in children with no history of medication or systemic manifestations. It is postulated that mechanical factors affect immature eccrine glands. The treatment is controversial, although we know that it can be conservatively managed. On the other hand, histological diagnosis, which presents typical findings, would not be necessary in all cases, since most of them present characteristic symptoms and spontaneous remission in less than three weeks. We present two cases of IPPH in children (AU)

Nódulos y pápulas eritematosas en piernas y rodillas / Nodules and Erythematous Papules on the Lower Legs and Knees

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Tricogerminoma: una neoplasia con diferenciación folicular y una morfología característica / Trichogerminoma: a neoplasm with follicular differentiation and a characteristic morphology

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Staphylococcus lugdunensis: un patógeno emergente en infecciones de piel y partes blandas / Staphylococcus lugdunensis: An Emerging Pathogen in Skin and Soft Tissue Infections

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