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Hair follicle anatomy

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Sebaceous cyst

Alternative Names: Epidermal cyst; Keratin cyst; Epidermoid cyst Symptoms: 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 Signs and tests: 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.

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