Updates in Skin Adnexal Tumors.

Cutaneous adnexal tumors recapitulate hair follicles, sweat glands, and/or sebaceous glands. These tumors range from benign to malignant and might herald an underlying inherited tumor syndrome. Accurate classification of adnexal tumors is thus critical but can be challenging due to many knowledge gaps in this area. Recent advances have dramatically improved our understanding and diagnosis of adnexal tumors. Here, we review several recently described adnexal carcinomas and summarize new molecular drivers reported in previously established tumor entities. We highlight morphologic, immunohistochemical, and molecular clues helpful for diagnosis of these adnexal tumors.