What Does a Sebaceous Cyst Look Like?

The term sebaceous cyst commonly describes an epidermoid cyst. It may look like a smooth, round or oval bump that sits under the skin and moves slightly when touched. The overlying skin can look normal, or there may be a small central opening. Some cysts contain thick, pale material and have an unpleasant odour if they open.

Inflammation can make a cyst red, warm, swollen, and sore. These changes can resemble an abscess or another skin lump. A photograph or online description cannot reliably distinguish them, so changes over time and a hands-on examination are useful.

Do not squeeze, lance, or repeatedly press the lump. Keep the skin clean and reduce rubbing from clothing, equipment, or shaving. Make a note of its size, tenderness, colour, and any fluid. For background, read [Skin Lumps](/symptoms/skin-lumps/). If a clinician confirms a cyst, [Cyst Removal](/treatments/surgical-dermatology/cyst-removal/) may be discussed when it is troublesome or repeatedly inflamed.

Seek prompt care when a lump grows quickly, becomes very painful, feels hot, spreads redness, releases pus, or comes with fever. Urgent assessment is needed for swelling that interferes with breathing, swallowing, vision, or movement. A firm lump that persists, changes, or bleeds should also be examined rather than judged by its appearance.

Ask what features support a cyst diagnosis and what else should be considered. Ask whether the lump is inflamed or infected, whether [Abscess Drainage](/treatments/minor-procedures/abscess-drainage/) is relevant, and whether a [Steroid Injection Into The Skin](/treatments/injectables/intralesional-steroid-injection/) could reduce inflammation in your particular case.