What should you know about very small hard lump under skin?

A firm bump may be a blocked pore, cyst, scar tissue, inflamed hair follicle, or a small benign growth. A tender, warm lump that becomes red can occur with [Boils](/conditions/boils/), while a slowly changing or bleeding spot needs a clinician to consider other diagnoses, including [Basal Cell Carcinoma](/conditions/basal-cell-carcinoma/). A lump's small size does not identify its cause, and a photo or examination may be needed.

Do not squeeze, pierce, or repeatedly press the area; this can cause inflammation, infection, or scarring. Take a clear photograph beside a familiar object and record its location, colour, tenderness, and whether it changes. Keep the area clean and avoid friction from tight clothing or shaving until you know more.

Book a review if the lump persists, enlarges, returns, or remains unexplained. A clinician may examine it with magnification and decide whether observation, sampling, removal, or another approach is appropriate. The [Skin Lumps](/symptoms/skin-lumps/) guide provides broader context. An inflamed scar-like lesion is sometimes treated with a [Steroid Injection Into The Skin](/treatments/injectables/intralesional-steroid-injection/), but only after assessment.

Seek prompt care for rapidly increasing pain, spreading redness, warmth, pus, fever, or red streaking. Arrange a skin examination for a lump that bleeds, crusts, ulcerates, changes colour, becomes fixed, or repeatedly heals and returns. Do not wait for pain: some concerning skin growths can be quiet while they change.

Ask what features make the lump more consistent with a cyst, inflamed follicle, scar, or growth; whether it should be measured or photographed; and whether sampling or removal is needed. Ask how to care for the site and which changes should prompt an earlier appointment.