Most bumps on your butt aren’t actually acne. They’re almost always folliculitis, an infection or irritation of a hair follicle, which looks like a small red or white pimple at the base of a hair. The good news: mild cases clear up on their own or with simple home care within a week or two. Here’s how to treat what you have and keep it from coming back.
What’s Actually Causing the Bump
True acne (the kind you get on your face) is driven by oil glands clogging pores. Your buttocks don’t have many of those oil glands, so the pimple-like bumps there are usually one of three things:
- Folliculitis. The most common culprit. Bacteria, usually Staphylococcus aureus, get into a hair follicle through friction, a small scrape, or prolonged moisture. The follicle swells into a red or white bump that can be tender or itchy. Sitting for long periods, tight clothing, and sweating all increase your risk.
- Keratosis pilaris. Small, rough, skin-colored or red bumps that feel like sandpaper or goosebumps. These form when keratin, a protective protein, builds up and plugs the pore opening. They don’t come to a head like a pimple and aren’t painful.
- Contact dermatitis. A reaction to something touching your skin, like a new detergent, fabric softener, or soap. This shows up as red bumps or a rash, sometimes with small blisters, typically one to two days after exposure to the irritant.
Knowing which type you’re dealing with matters because the treatment differs. A single tender bump with a white center is most likely folliculitis. A patch of rough, painless bumps is probably keratosis pilaris. A widespread rash that appeared after switching laundry products points to contact dermatitis.
Home Treatments That Work
Warm Compresses
For a single inflamed bump, a warm, moist cloth applied to the area for 5 to 10 minutes, 3 to 6 times a day, is the simplest first step. The warmth increases blood flow, helps draw out any trapped material, and eases pain. Use a clean cloth each time to avoid reintroducing bacteria.
Benzoyl Peroxide Wash
Benzoyl peroxide kills the bacteria that cause folliculitis. Look for a body wash or cleanser with a concentration around 5% to 10%. Lather it onto the affected area in the shower, let it sit briefly, then rinse. Start with once daily for the first week. The skin on your butt is thicker than your face, so it tolerates these concentrations well, but the wash can bleach towels and underwear.
Exfoliating Creams for Rough Bumps
If your bumps are the rough, sandpapery keratosis pilaris type, benzoyl peroxide won’t help much. Instead, use a cream containing lactic acid, salicylic acid, or urea. These ingredients loosen and dissolve the keratin plugs blocking your pores while moisturizing dry skin. Apply after showering to clean, slightly damp skin. Results take a few weeks of consistent use.
What Not to Do
Don’t squeeze or pop the bump. The skin on your buttocks is under constant pressure from sitting, and squeezing pushes bacteria deeper into the follicle. This can turn a minor bump into a painful boil or abscess. Avoid scrubbing the area with rough loofahs or exfoliating brushes, which create tiny breaks in the skin that bacteria use as entry points.
Preventing New Bumps
Most butt bumps come back because the conditions that caused them haven’t changed. A few habit shifts make a real difference.
Shower as soon as you can after sweating. Once you stop sweating heavily, usually within 20 to 30 minutes, that’s your window. Sitting in damp workout clothes is one of the fastest ways to trigger folliculitis. If you can’t shower right away, at minimum change into dry clothes.
Wear loose, breathable fabrics. Cotton and linen allow air circulation against the skin and prevent follicles from getting trapped under moisture. During exercise, moisture-wicking athletic wear pulls sweat away from your body. Avoid rough fabrics that create micro-abrasions. Wash workout clothes in hot water after each use.
If you spend long hours sitting, whether at a desk or driving, the combination of pressure, heat, and moisture creates ideal conditions for bacteria. Standing periodically and choosing a breathable chair cushion can help. Tight underwear or jeans that press fabric into your skin all day compound the problem.
For contact dermatitis bumps, the fix is identifying and removing the irritant. Switch to fragrance-free detergent and skip fabric softener for a few weeks to see if the bumps resolve.
When a Bump Needs Medical Attention
A single small bump that responds to warm compresses and benzoyl peroxide within a week or two is nothing to worry about. But some bumps signal something more serious.
A boil is a deeper infection that forms a painful, pus-filled pocket under the skin. You should get it evaluated if it worsens rapidly, causes a fever, keeps growing despite home care, hasn’t healed in two weeks, or keeps recurring. Large boils often need to be drained by a healthcare provider rather than left to resolve on their own.
Hidradenitis suppurativa is a chronic condition that causes painful, pea-sized lumps under the skin in areas where skin rubs together, including the buttocks. These lumps persist for weeks or months, recur frequently, and can eventually form tunnels under the skin and scarring. It typically starts after puberty and before age 40. If your bumps keep coming back in the same spots and leave scars, this is worth bringing up with a dermatologist.
“Hot tub folliculitis” is a specific type caused by bacteria found in poorly maintained hot tubs and pools. It appears 6 hours to 5 days after exposure, primarily in areas covered by a swimsuit. These bumps usually clear on their own but can be widespread and uncomfortable.
When Over-the-Counter Products Aren’t Enough
If benzoyl peroxide and warm compresses haven’t cleared things up after two to three weeks of consistent use, a doctor can prescribe topical antibiotics. These are applied directly to the skin and are generally effective against the staph bacteria responsible for most folliculitis. For keratosis pilaris that doesn’t respond to drugstore creams, prescription-strength exfoliants with higher concentrations of lactic acid or urea are available.