High Quality Content by WIKIPEDIA articles! A sebaceous cyst (a form of trichilemmal cyst) also known as a "wen", is a closed sac or cyst below the surface of the skin that has a lining that resembles the uppermost part (infundibulum) of a hair follicle and fills with a fatty white, semi-solid material called sebum. Sebum is produced by sebaceous glands of the epidermis. It is sometimes (but not always) considered to be equivalent to epidermoid cyst, or similar enough to be addressed as a single entity. Some sources state that a sebaceous cyst is defined not by the contents of the cyst (sebum) but by the origin (sebaceous glands). Because an epidermoid cyst originates in the epidermis, and a pilar cyst originates from hair follicles, neither type of cyst would be considered a sebaceous cyst by this definition. However, in practice, the terms are often used interchangeably.
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