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Sebaceous cyst
Definition:
A sebaceous cyst is a closed sac found just under the skin containing pasty- or cheesy-looking skin secretions. Alternative Names:
Epidermal cyst; Keratin cyst; Epidermoid cyst Text Continues Below
Causes, incidence, and risk factors:
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.
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