A sebaceous cyst is a non-cancerous, closed sac that forms under the skin, typically filled with a substance called sebum, which is an oily substance produced by sebaceous glands. These cysts often appear as small, round bumps on the skin and can range in size. They are generally painless, though they may become irritated or infected, causing discomfort, swelling, or redness. Sebaceous cysts are commonly found on the face, neck, or torso. In some cases, they may need to be drained or removed if they cause problems.
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