Syringoma presenting as symmetric eruptive papules on the forearms

One of the benign tumors of the sweat glands is a syringoma. A rare subtype of this tumor is the eruptive type, which is often seen before or during puberty. Here we report a case of eruptive syringoma in a 15-year-old girl. A 15-year-old girl was visited in our department, with a three-year history of numerous tancolored papules territorialized on both the forearms. There were no other skin or systemic findings, and our differential diagnoses included xanthoma, lichen planus, and sarcoidosis. A skin biopsy was performed, revealing mild epidermal acanthosis. There were ductal structures lined by a double epithelium in association with elongated, tadpole-like epithelial cells in the dermis. Dermal collagen had thickened. Inflammatory cells were inconspicuous. Taken together, the above morphologic findings confirmed the diagnosis of an eruptive syringoma. Clinical diagnosis of eruptive syringoma is hard and histological evaluation is decisive for achieving the correct diagnosis.