What should you know about a sebaceous cyst whitehead?

A so-called sebaceous cyst is often an epidermoid cyst: a small sac under the skin that contains keratin, a skin protein. The visible white or dark point can be the cyst opening. The lump may feel smooth, firm, and movable, and it can remain quiet for a long time. A white centre does not confirm the diagnosis; an inflamed spot, blocked pore, or abscess can look similar. See more about evaluating [Skin Lumps](/symptoms/skin-lumps/).

Keep the area clean and avoid pressing, needling, or trying to empty it. Friction from clothing, shaving, or repeated touching can make the opening sore. A clinician can examine the lump and decide whether observation is reasonable. If it is painful or inflamed, treatment may calm the inflammation; [Steroid Injection Into The Skin](/treatments/injectables/intralesional-steroid-injection/) may be discussed in suitable cases. A persistent or bothersome cyst can be treated with [Cyst Removal](/treatments/surgical-dermatology/cyst-removal/), which addresses the sac rather than only its contents.

Arrange medical assessment if the lump is new, enlarging, repeatedly returning, or difficult to identify. Seek prompt care when it becomes increasingly red, hot, swollen, tender, or starts draining foul-smelling material, or when you feel unwell. Do not attempt home drainage; an infected collection may need [Abscess Drainage](/treatments/minor-procedures/abscess-drainage/).

Could this be an epidermoid cyst or another type of lump? Does the opening show inflammation or infection? Should it be watched, treated, or removed? What aftercare would be needed if it drains or is removed?