Author: Juliet Cohen
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A sebaceous cyst is a closed sac under the skin filled with a cheese-like or oily material. Sebaceous cysts are commonly seen on the scalp, labia, scrotum, chest, and back, but can be found anywhere on the body. A foul odor is also often present in the substance called keratin which fills sebaceous cysts. Keratin is a protein that creates the sac of cells called sebaceous cysts. The bumps or lumps you can feel under your skin are actually the sac of cells. Sebaceous cysts are often the result of swollen hair follicles, or skin trauma. The scalp, ears, back, face, and upper arm, 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. In males a common place for them to develop is the scrotum and chest.
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