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A sebaceous cyst (a form of trichilemmal cyst; also called: keratin cyst; sometimes wrongfully called: epidermal cyst or epidermoid cyst (see ICD-10 L72.0)) is a closed sac or cyst below the surface of the skin that fills with a fatty white, semi-solid material called sebum.
The scalp, ears, genitals, and face are common sites for sebaceous cysts, though they may occur anywhere on the body except the palms of the hands and soles of the feet. They are smooth to the touch, vary in size, and are generally round in shape.
They are generally mobile masses that can consist of fibrous tissues and fluids, to a fatty, (sebaceous), substance that resembles cottage cheese, or a somewhat viscous, serosanguinous fluid, (containing purulent and bloody material). A cyst can be excised in its entirety or, more commonly, can rupture during excision and removal. Cysts can recur, either if they are ruptured or not