Small bumps under the skin: what to know

A bump may feel smooth, firm, soft, itchy, or tender. Folliculitis can produce inflamed bumps around hairs; heat rash often appears where sweat and friction affect the skin; keratosis pilaris tends to feel rough and follicular. Milia are small keratin-filled cysts, while lichen planus can cause a more persistent inflammatory change. These descriptions overlap, so distribution and progression matter.

Note whether the area is red, scaly, warm, draining, or changing. Also consider recent shaving, exercise, tight clothing, a new cosmetic, or a new medicine. Do not treat a persistent lump as a diagnosis based only on how it feels.

Clean the area gently, keep sweaty skin dry, and reduce friction from tight clothing or repeated rubbing. Avoid picking, squeezing, harsh scrubs, and sharing towels or razors. A cool compress may soothe heat-related irritation. If itching is troublesome, ask a clinician or pharmacist whether antihistamine treatment is suitable, especially if you take other medicines.

Book a dermatology review if bumps recur, spread, or remain present despite gentle care. Once the cause is known, treatment may be topical, medical, or a targeted procedure such as cryotherapy for an appropriate lesion.

Seek prompt care for rapidly increasing redness or swelling, significant pain, warmth, pus, fever, or red streaking. Get urgent help for facial swelling with breathing difficulty, or for a rash with blistering or skin peeling. A non-urgent assessment is appropriate for a firm, changing, bleeding, or unexplained bump.

Does the texture suggest folliculitis, heat rash, keratosis pilaris, milia, or another condition? Could friction, shaving, or a product be contributing? What changes should prompt an earlier review?