Eccrine poroma on the forearm in a child: A rare presentation

Abstract

Eccrine poroma (EP) is a benign adnexal tumor arising from the terminal duct of the sweat gland. It represents 10% of all sweat gland tumors and is most commonly found on the sole or the side of the foot [1]. Herein, we report a case of EP on the right forearm in a child. A thirteen-year-old female with no past medical history presented with an asymptomatic nodule on the right forearm (Fig. 1). The nodule had gradually increased in size and was not associated with pain, pruritus, or bleeding from the lesion. A physical examination revealed a firm, mobile flesh-colored nodule on the right forearm 7 × 6 mm in size. A dermoscopic examination revealed chalice-like vessels, whitish-pink areas, and yellow structureless areas (Fig. 2). The nodule was completely excised and histopathological findings showed a tumor proliferation connecting to the epidermis, organized on thick, cellular cords and composed of small, cohesive, round cells forming homogeneous layers. These cellular cords were separated by fibrous interstitial tissue, not especially inflammatory, and traversed by regularly distributed capillaries (Figs. 3 and 4). Based on these histological findings, a diagnosis of EP was reached.