Keratin Bumps on Arms: What to Know

Small, rough, skin-coloured or pink bumps on the outer upper arms commonly fit keratosis pilaris, where keratin blocks hair-follicle openings. Folliculitis can look more inflamed and may include tenderness or pus. Heat rash tends to follow sweating and trapped heat, while lichen planus or milia have different appearances and distributions. Skin bumps are a broad symptom label; the presence of bumps does not prove one condition.

Use a mild cleanser and lukewarm water, then apply a plain moisturiser while the skin is still slightly damp. Products containing a keratolytic ingredient may smooth roughness, but introduce one product at a time and stop if burning or a rash develops. Avoid harsh scrubs, picking, shaving over irritated areas, and tight clothing that rubs. If itch is prominent, ask a clinician or pharmacist whether antihistamine treatment is appropriate; treatment choice depends on the cause.

Arrange a skin assessment if bumps spread quickly, become painful, drain, bleed, form firm individual lumps, or fail to settle with gentle care. Seek prompt help for facial swelling, breathing difficulty, fever, or rapidly spreading redness. A clinician can distinguish keratosis pilaris from folliculitis, heat rash, milia, or another eruption before recommending procedures such as cryotherapy for a specific lesion.

Do the bumps look like keratosis pilaris, folliculitis, heat rash, milia, or another condition? Which moisturiser or smoothing ingredient suits my skin? Should I avoid hair removal or consider treatment for itch or an individual troublesome lesion?