Background:Temporary black henna tattooing is highly popular among children and young adults in some regions. The unmonitored addition of different products to darken the color of pure henna has been the cause of many tattoo-associated dermatoses. Observation:Hypertrichosis secondary to henna pseudotattoo is a rare, newly recognized cutaneous manifestation. Only 4 case reports of henna tattooing causing localized hypertrichosis have been reported in the literature. We report a case of hypertrichosis and eczematous reaction to temporary henna tattoo.Conclusion:Hypertrichosis secondary to black henna is independent of the presence of contact dermatitis. The mechanism by which black henna induces hair growth remains unclear

Background:Dermatofibromas are common benign skin neoplasms.Main observations:The authors report the clinical, dermoscopic and histopathological features of a hemosiderotic dermatofibroma mimicking melanoma in an 85-year-old woman. Conclusions:Atypical dermoscopic patterns may prove difficult to differentiate from melanocytic lesions, and because of its polymorphic, melanoma-like presentation, definite diagnosis of hemosiderotic dermatofibroma can be reached by histopathological examination.

Background:Colloid milium is a rare cutaneous deposition disorder characterized by translucent papules developing on sun-exposed regions such as the face, neck and dorsal aspects of the hands and back. Exogenous ochronosis is caused by the accumulation of homogentisic acid resulting from long-term application of certain topical agents. Histology is characterized by yellow-brown pigment deposits in the papillary dermis. Prolonged use of hydroquinone may result in the development of the pigmented form of colloid milium, sometimes in association with ochronosis.Case report:A 53-year-old man presented with a 3-year history of multiple slow spreading pigmented papules on the dorsa of his hands, nose and ears. The patient had a long history of exposure to sun and fertilizers with no history of using hydroquinone bleaching creams. A later biopsy revealed the diagnosis of pigmented colloid milium associated with exogenous ochronosis.Conclusion:UV light damage and long contact with fertilizers may have a role in the development of pigmented colloid milium associated with exogenous ochronosis.

Background:Erlotinib is a targeted anti-cancer drug which acts through the inhibition of epidermal growth factor receptor (EGFR).Main observations:A 79-year-old developed bilateral ectropion after he received erlotinib treatment for lung adenocarcinoma. The ectropion completely resolved with symptomatic treatment without any modification in erlotinib therapy.Conclusions:EGFR inhibitors are frequently associated with a variety of mucocutaneous adverse events. Ocular toxicity associated with these agents has been reported rarely. We present this case to underline the importance of recognition of newly reported cutaneous and ocular adverse events of targeted therapies.

Lamellar ichthyosis is a rare congenital disorder characterized by collodion membrane at birth and facial anomalies (eclabium and ectropion). The major underlying genetic defect is in TGM1, with mutations of this gene found in 50% of patients. An early diagnosis is fundamental in view of establishing a specific treatment due to the severity of the disease. We report a case of severe lamellar ichthyosis and arthrogryposis, without the typical facial presentation, negative for TGM1 mutations. The clinical improvement was achieved only after treatment with oral retinoids, highlighting the importance of early diagnosis and prompt administration of a specific therapy.

Dermatofibrosarcoma protuberans (DFSP) in children is often clinically misdiagnosed as hemangioma or vascular malformation. Ultrasonography and color Doppler imaging are useful noninvasive tools for the diagnosis of skin tumors and may help distinguish DFSP from other vascular skin lesions in children.

We report a case with an unusual manifestation of bullous pemphigoid (BP) in a 57-year-old woman. She presented with a one-month history of pruritus and multiple annular patches with central regression on her trunk and extremities and there were no signs of corresponding internal malignancy. Eosinophilic spongiosis was observed in histopathologic examination and direct immunofluorescence studies revealed a strong linear staining pattern of the basement membrane zone with C3 and IgG. This unusual case indicates that a lack of blisters does not necessarily exclude a diagnosis of BP, and supports previous reports suggesting gyrate erythema can be an initial manifestation of bullous disease.