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A sebaceous cyst is a closed sac under the skin filled with a cheese-like or oily material.
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Sebaceous cysts most often arise from swollen hair follicles. Skin trauma can also induce a cyst to form. A sac of cells is created into which a protein called keratin is secreted.
These cysts are usually found on the face, neck, and trunk. They are usually slow- growing, painless, freely movable lumps beneath the skin. Occasionally, however, a cyst will become inflamed and tender.
Habif TP. Clinical Dermatology . 4th ed. St. Louis, Mo: Mosby; 2004.
Roberts JR, Hedges JR. Clinical Procedures in Emergency Medicine . 4th ed. Philadelphia, Pa: WB Saunders; 2004.
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