Abstract The number of skin infections caused by atypical mycobacteria has increased in recent decades. They usually appear after contact with wounds and interruptions in the integrity of the skin. The present report describes a case of cutaneous infection by Mycobacterium marinum, in a young, immunocompetent patient, with a prolonged evolution, diagnosed through a skin lesion culture (from a spindle biopsy of the skin). The patient was treated with multidrug therapy, including clarithromycin, doxycycline, and rifampicin, due to the lesion extent, with satisfactory results. A brief review of the literature is also provided.

RESUMO A plasmocitose cutânea é uma dermatose rara que em sua forma clássica se caracteriza pela presença de múltiplas pápulas e nódulos castanho-avermelhados principalmente no tronco. Acomete mais frequentemente asiáticos idosos, com poucos relatos em caucasianos e em pacientes jovens. Na histopatologia observa-se proliferação policlonal de plasmócitos maduros. O objetivo deste relato é apresentar um caso de manifestação atípica desta rara doença, tanto pelos aspectos clínicos quanto epidemiológicos.

ABSTRACT Cutaneous plasmacytosis is a rare dermatosis that is classically characterized by the presence of multiple papules and reddish-brown nodules mainly in the trunk. It most commonly affects elderly Asians, with few reports in Caucasians and young patients. On histopatho-logy there is a polyclonal proliferation of mature plasm cells. The objective of this report is to present a case of atypical manifestation of this rare disease, both due to clinical and epidemiological aspects.

Abstract Confluent and reticulated papillomatosis of Gougerot and Carteaud is a rare dermatosis with onset during puberty, more prevalent in females than in males. The pathogenesis is unknown, but some theories suggest either a keratinization or endocrine disorder. The lesions are verrucous, brownish, hyperkeratotic papules or spots that coalesce in a confluent and/or reticulated pattern. This report presents a case with extensive cutaneous involvement associated with acanthosis nigricans and good response to treatment with methotrexate.

Abstract Lymphangioma is a rare benign disease of the lymphatic vessels. Typically, they are primary conditions but may be acquired secondarily, such as those caused by irradiation during radiotherapy for the treatment of breast cancer. The local lymphatic obstruction provoked by irradiation causes the appearance of asymptomatic hyaline vesicles on the irradiated skin. The present report describes a 78-year-old female patient, who initially presented hyaline vesicles that progressed into multiple papules with serous exudation of a yellowish and odorless secretion on the area of chronic radiodermitis in right breast. Despite the rarity of the case, we emphasize the importance of knowledge regarding dermatological disease for early diagnosis and proper medical conduct.