sebaceous adenoma (MONDO_0002375) is a benign, well circumscribed neoplasm arising from the sebaceous glands. It usually presents as a small yellowish tumor in the sun exposed skin of head and neck. It is characterized by the presence of sebaceous cells aggregates with a peripheral rim of basaloid cells. Also known as: adenoma of sebaceous gland, adenoma of the sebaceous gland, adenoma, sebaceous, benign, sebaceous adenoma (morphologic abnormality), sebaceous gland adenoma, skin appendage sebaceous adenoma.