A sebaceous cyst is a small non-cancerous lump or bump on the skin. It is usually found on the face, neck, upper chest, and upper back but can also appear on other body parts.
It develops gradually beneath the skin and is dome-shaped and smooth in appearance. It may become infected or inflamed, grow in size, and emit a foul odour, sometimes with an accompanying discharge of a cheese-like substance. The inflammation can cause the skin to be tender and sore. Treating this issue is often recommended to alleviate discomfort and improve the skin’s appearance.