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BACKGROUND: Pityriasis lichenoides is a rare, acquired skin disorder of unknown etiopathogenesis. Pityriasis lichenoides et varioliformis acuta is one of its forms of presentation and is clinically characterized by polymorphous lesions usually covered by hemorrhagic crusts with autolimited tendency, which may leave varioliform scars and residual hypo- or hyperpigmented macules. Diagnosis is clinical and is confirmed by histopathology, where confluent parakeratosis, necrotic keratinocytes and superficial and deep lymphohistiocytic inflammatory infiltrate can be observed. Regarding treatment there is no consensus, but tetracyclines, cyclosporine, methotrexate and phototherapy are described. CLINICAL CASE: A 15-year-old female patient with diagnosis of pityriasis lichenoides et varioliformis acuta, who presented relieve of the lesions after one month of management with doxycycline.CONCLUSIONS: Pityriasis lichenoides et varioliformis acuta is an uncommon dermatosis and few cases are reported in the literature. There is limited information on the theories of its etiopathogenesis and therapeutic options, which represents a challenge for the dermatologist. This case is striking given the significant improvement in a shorter time than established in the literature and with a tetracycline not frequently used in the reported cases. [ABSTRACT FROM AUTHOR]

BACKGROUND: Dermoscopy is a diagnostic technique classically used for the study of pigmented skin lesions, nowadays, its use is gaining strength in inflammatory and infectious diseases, where it can reduce biopsies, and occasionally can give prognostic information. Pityriasis lichenoides chronica is an inflammatory skin disease, part of the papulosquamous dermatosis group. Its diagnosis requires histopathological confirmation. CLINICAL CASES: This paper reports the cases of four Latin-American patients with pityriasis lichenoides chronica and their dermoscopic characteristics. The first case corresponded to a phototype III 25-year-old woman, the second one to a phototype II 61-year-old woman, the third one to a phototype VI 34-year-old man and the fourth one to a phototype IV 36-year-old woman. CONCLUSIONS: In this study, the most frequent dermoscopic features were irregular punctate and linear vessels with clustered distribution, yellow-orange background, focal scales that can vary in color, and the absence of follicular detection. In addition, it was noted that dermoscopic findings may vary according to skin phototypes. [ABSTRACT FROM AUTHOR]

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Background: the Mucha-Habermann disease is a cutaneous clinical manifestation of unknown etiology that frequently appears in young patients. The aim was to present a Mucha-Habermann disease occurred in an old man heart transplanted. Clinical case: a 62 year-old male, heart transplant recipient, who four years after that transplantation procedure presented papular lesions in neck, thoracic members which extent to all body surface that evolved vesicles and pustular lesions. A skin biopsy was performed and the Mucha-Habermann disease was diagnosed. The patient was treated with steroids and antimicrobial therapy with favorable response. After two years there are no skin lesions. Conclusions: the Mucha-Habermann disease is a low frequent disease and it requires skin biopsy to confirm diagnose. This is an uncommon case due to the age and kind of patient. [ABSTRACT FROM AUTHOR]