What should you know about skin bumps on arms?

Even, rough bumps on the outer upper arms commonly fit keratosis pilaris, where keratin collects around hair follicles. Red bumps centred on hairs may be folliculitis, while clusters after heat and sweating may fit heat rash. Itch, scale, blisters, pain, or a sudden spread changes the possibilities. A single firm bump or a bump that changes over time deserves a closer look. Arm bumps are a symptom, not a diagnosis, and photographs or an examination may be needed to identify them.

Use a gentle cleanser and moisturiser without strong fragrance. For rough, persistent areas, a clinician may recommend a moisturiser containing an exfoliating ingredient, introduced gradually because over-scrubbing can worsen irritation. Keep sweaty skin cool and dry, wear breathable sleeves, and avoid scratching or picking. Do not share towels or razors if bumps are draining. Record when they began, whether both arms are affected, and any new product, detergent, medicine, or outdoor exposure.

Seek medical advice if the bumps are painful, filled with pus, rapidly spreading, repeatedly returning, or interfering with sleep. Prompt care is appropriate for fever, marked warmth, swelling, red streaking, facial swelling, or breathing difficulty. Arrange a dermatology review for a persistent, bleeding, crusting, or changing bump. Treatment depends on the cause and may range from skin care to Antihistamine Treatment; Cryotherapy (Lesion Removal) is reserved for selected lesions after diagnosis.

Ask whether the bumps resemble keratosis pilaris, folliculitis, heat rash, or another condition; which moisturiser is suitable; and what changes should trigger review. Tell the clinician about itch, pain, drainage, scale, allergies, and products used on the arms.