Eccrine Poroma Simulating Amelanotic Melanoma

Abstract

Eccrine poroma correspond to a rare benign neoplasia, originating from the intraepidermal ductal epithelium of the sweat glan. Clinically, it usually manifests as a solitary tumor most often located on the sole of the foot, so it is important to perform a histological study to confirm a diagnosis. However, its clinical characteristics can be very heterogeneous and sometimes it must be differentiated from melanoma. It is presented the case of a 59-year-old female patient, with an apparent health history, who presents a mole in the left gluteal region, which has grown in recent months asymptomatically. Before the skin, clinical and dermatoscopic examination, basal cell carcinoma, amelanotic melanoma and eccrine poroma are considered. Biopsy is performed to confirm the diagnosis of eccrine poroma pigment. The interesting data of this case is that it shows an atypical topographic presentation of eccrine poroma. The clinical and dermatoscopic characteristics of the lesion can be very similar to other entities in dermatology, such as amelanotic melanoma, hence the need to confirm the diagnosis histologically.