Apocrine hidrocystoma appearing after Er:YAG laser treatment: a case report.

Apocrine hidrocystomas are benign, cystic tumours arising from the apocrine sweat gland. They usually present as a solitary papule or nodule in the periorbital area and it is uncommon for multiple lesions to appear. We present a case of multiple apocrine hidrocystomas on the nasal dorsum which became apparent after ablative laser treatment. We also review the literature for apocrine hidrocystoma, including their clinical presentation, histopathological findings and treatment options. 2020, Japan Medical Laser Laboratory.