What should you know about red pimple bumps on arms?

Small, rough, closely grouped bumps on the outer upper arms are typical of keratosis pilaris, where keratin plugs hair follicles. Folliculitis can produce red or tender bumps centred on hairs, sometimes with pus, after sweating, shaving, friction, or occlusive clothing. The two patterns can overlap, and appearance alone cannot confirm the cause. Location elsewhere on the arms, itch, pain, drainage, and sudden onset help a clinician narrow the possibilities.

Clean gently, moisturise regularly, and avoid picking, harsh scrubbing, tight sleeves, and shaving over inflamed areas. For rough bumps, a moisturiser containing urea, lactic acid, or salicylic acid may smooth the surface; introduce one product slowly and stop if it burns. Keep sweaty clothing away from the skin and use a clean razor if shaving. A clinician can advise whether folliculitis needs a targeted medicine.

Book a review if bumps are painful, pus-filled, spreading, repeatedly returning, leaving scars, or not settling with gentle care. Seek prompt help for rapidly worsening redness, severe tenderness, fever, or red streaks moving up the arm. These features reflect possible active inflammation or infection and should not be judged by bump count alone.

Do the bumps fit keratosis pilaris or folliculitis? Should I change shaving, exercise, or clothing habits? Which moisturiser or medicine is suitable for my skin? How can I reduce recurrence and prevent marks?