Genitogluteal porokeratosis - Case report
Male patient, 37 years old, complained of the onset of skin lesions on the groin and buttocks for approximately two years accompanied by intense local itching. The dermatological examination showed erythematous papules and plaques with elevated and well-defined borders on the scrotum; brownish macules and papules on the groin and thighs; well-defined brownish erythematous keratotic papules and annular plaques on the buttocks and gluteal cleft (, and ). The lesions started located on the scrotum and groin, with progression to the buttocks region (gluteal cleft). Currently stable. The patient received previous treatment with systemic and topical antifungal drugs, isolated or combined topical corticosteroids, without clinical improvement. No significant personal or familiar pathological history. The previous topical therapy was discontinued, and an incisional biopsy of a papule of the left scrotum was performed. The histopathological examination showed superficial perivascular dermatitis with columns of parakeratosis, consistent with the diagnosis of porokeratosis ().