Sebaceous cyst

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Hair follicle anatomy

Epidermal cyst; Keratin cyst; Epidermoid cyst

• Usually a nontender, small lump beneath the skin
• Redness, tenderness, or increased temperature of the skin over the area may occur infection
• Grayish-white, cheesy, foul-smelling material may drain from the cyst

In most cases, your physician can diagnose a cyst based on its appearance. Occasionally, a biopsy may be needed to rule out other conditions with a similar appearance.

Review Date: 04/30/2005
Reviewed By: Jonathan Kantor, M.D., Department of Dermatology, University of Pennsylvania Medical Center, Philadelphia, PA. Review provided by VeriMed Healthcare Network.