Itchy red bumps are one of the most searched skin complaints — and one of the easiest to misidentify. The trick is to look at where the bumps are, how they're arranged, and what changed in the last 24–48 hours (new product, travel, season change, stress). Below are the seven most common causes ranked by frequency.
1. Insect Bites (Mosquito, Bedbug, Flea)
Look: Small puncture in the centre of each bump. Mosquito bites are random; bedbugs leave 3 bumps in a straight line ("breakfast-lunch-dinner pattern") on exposed sleeping skin; fleas cluster around ankles and lower legs.
Treatment: Wash, apply calamine or 1% hydrocortisone, take an oral antihistamine.
2. Hives (Urticaria)
Look: Raised pale or pink welts with smooth edges that move around the body within hours. Often triggered by food, medication, infection, or stress.
Treatment: Non-drowsy antihistamine (cetirizine, loratadine) for 1–2 weeks. See a doctor if it lasts longer than 6 weeks.
3. Heat Rash (Miliaria)
Look: Tiny pinpoint bumps in clusters on the neck, chest, back, or skin folds — after sweating or hot weather.
Treatment: Cool down, loose cotton, calamine. See our heat rash vs allergic rash guide.
4. Contact Dermatitis
Look: A red, often blistered patch with a clear "border" where skin touched the trigger — fragrance, nickel, latex, plants, hair dye, sunscreen.
Treatment: Stop the trigger, apply 1% hydrocortisone for up to 7 days. Patch test if you can't identify the cause.
5. Folliculitis
Look: Small red bumps each centred on a hair follicle — often on the chest, back, thighs, or scalp. Worse after shaving, hot tubs, or tight clothing.
Treatment: Antibacterial wash (chlorhexidine), warm compresses. See a GP if it spreads or doesn't clear in 2 weeks.
6. Eczema Flare-Up
Look: Patches of dry, scaly, intensely itchy skin — often in the bend of elbows, behind knees, on the neck or hands. Recurring flares are a hallmark.
Treatment: Daily moisturiser, short courses of topical steroids. See our eczema vs fungal rash guide.
7. Scabies
Look: Intensely itchy bumps (worse at night) plus thin, wavy "burrow" lines — typically between fingers, on wrists, around the waist, or genitals. Highly contagious.
Treatment: Prescription permethrin cream. The whole household needs treatment simultaneously.
Quick AI identification
Upload a photo of your itchy bumps and our AI will rank the most likely causes — bites, hives, heat rash, eczema, and more.
Upload a photo → AI checkWhen to See a Doctor
Same-day care if bumps come with: fever, breathing trouble, facial/throat swelling, blistering, or rapid spread. Routine GP if bumps last longer than 2 weeks, keep recurring, or interfere with sleep.
Read our full guide on when a rash is serious.