A sebaceous cyst is a closed sac occurring just under the skin. You may feel the bumps or lumps under your skin. Keratin is a protein that creates the sac of cells called sebaceous cysts which may have a “pasty” or “cheesy” appearance and a foul odor.
Sebaceous cysts are caused by blocked sebaceous glands, swollen hair follicles, and/or excessive testosterone production.
Surgical excision of a sebaceous cyst is a simple procedure to completely remove the sac and its contents. An infected cyst may require oral antibiotics or other treatment before excision.