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A Cyst is a closed sac below the surface of the skin that has a lining that resembles the uppermost part of a hair follicle and fills with a fatty white, semi-solid material called sebum. Sebum is produced by sebaceous glands of the skin.
The scalp, ears, back, face, and upper arms, are common sites for sebaceous cysts, though they may occur anywhere on the body. Most cysts 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, substance that resembles cottage cheese. Surgically, a cyst can usually be excised in its entirety. A completely removed cyst will not recur, though if someone a predisposition to cyst formation further cysts may develop in the same general area.