What should you know about tiny cysts under skin?

An epidermoid cyst can feel like a round, mobile lump just below the surface. It may have a small opening, although an opening is not always visible. The contents can be thick rather than liquid. Size and firmness can vary with irritation. A cyst is different from an abscess, which is a collection of infected material and is more likely to be painful, hot, red, or rapidly swollen. Because several skin lumps can resemble one another, an examination is useful.

Leave the area alone, avoid tight clothing or repeated friction, and use gentle cleansing. Do not pop or drain it yourself. A quiet cyst may only need monitoring. If inflammation is present, a clinician may consider a [Steroid Injection Into The Skin](/treatments/injectables/intralesional-steroid-injection/), while a collection of infected material may need [Abscess Drainage](/treatments/minor-procedures/abscess-drainage/). For a persistent or troublesome sac, [Cyst Removal](/treatments/surgical-dermatology/cyst-removal/) can be discussed. See [Skin Lumps](/symptoms/skin-lumps/) for broader symptom context.

Book a medical review if the lump grows, becomes fixed, returns after settling, or interferes with movement or clothing. Seek prompt care for spreading redness, increasing warmth, pus, marked pain, or fever. Sudden swelling with severe tenderness needs timely assessment because an abscess may require treatment.

Ask whether this is a cyst or abscess, whether the skin opening matters, what treatment fits its current state, and how recurrence or scarring can be reduced.