Pigmented eccrine poroma: A clinical dermoscopy challenge

Eccrine poroma is a benign neoplasia originated from the intraepidermal portion of the sweat gland duct. It is characterized by a papule, plaque or nodule, normochromic or erythematous, exophytic or hyperkeratotic. Although its pathogenesis is still unknown, it seems to be related to radiation, trauma or scars. The pigmented variant, more frequent in blacks and affecting mainly nonacral areas, is responsible for 17% of the cases. Various clinical-dermatoscopic features have been described, directing its differential diagnosis to other benign and malignant neoplasia, such as seborrheic keratosis, epithelized pyogenic granuloma, basal-cell and squamous-cell carcinoma, angiofibroma, and melanoma.