A cyst is a slow-growing, protein-filled, dome-like, yellow or white lump that can move easily under the skin. There are many types of cysts – hundreds, actually. Unlike epidermoid cysts, which originate from the skin, and unlike pilar cysts, which come from hair follicles, true sebaceous cysts are rare and originate from your sebaceous glands.
Sebaceous cysts can be found on your entire body (except the palms of your hands and the soles of your feet).
When squeezed, the punctum (a small dome-shaped projection) will appear. Through that opening, the fluid (sebum) inside may be squeezed out (as seen in the photo below).
Sebaceous cysts are usually harmless. Very few can become malignant (cancerous).
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