Why Do I Have Bumps on My Arms That Won''t Go Away?

Persistent bumps on your arms are most commonly keratosis pilaris, affecting up to 40% of adults. This harmless condition occurs when keratin protein blocks hair follicles, creating small, rough bumps that feel like sandpaper. The bumps typically appear on upper arms, thighs, and sometimes cheeks. Other possible causes include folliculitis from bacterial infection, contact dermatitis from allergens, or eczema flare-ups. Keratosis pilaris often worsens in dry weather and improves with consistent moisturizing using urea or lactic acid lotions. If bumps are red, painful, or spreading rapidly, consult a dermatologist to rule out infections or other skin conditions requiring specific treatment.