The short answer: What most people call “butt acne” is usually folliculitis: irritated or infected hair follicles, set off by sweat, friction, tight clothing, long hours of sitting and hair removal. Everyday prevention works well: shower soon after sweating, wear breathable underwear, pause shaving or waxing during a flare, and don’t pick. Painful, deep or recurring lumps, fever or spreading redness need a doctor.
Pimple-like bumps on the buttocks are common and rarely talked about. Cleveland Clinic notes that true acne in this area is rare. The usual culprit is folliculitis, the inflammation of hair follicles that we cover in depth in our complete guide to folliculitis.
The good news is that the triggers on this part of the body are predictable, which makes prevention practical.
In this article
What folliculitis on the butt looks like
Folliculitis usually looks like a sudden acne breakout, with small bumps that may have a red ring around them, according to the American Academy of Dermatology (AAD). Each bump sits around a hair follicle. Cleveland Clinic describes red, pimple-like bumps that may be white-topped or filled with pus. On brown and Black skin, the redness can be hard to see, and DermNet notes that dark marks after inflammation are common in darker skin types (DermNet). The bumps may itch or feel tender, especially when you sit.
DermNet lists the buttocks among the most common sites for folliculitis, alongside the scalp, beard area, chest and back. The reason is simple: few parts of the body spend as much time warm, covered, sweaty and pressed against a chair.
Key takeaways
- Bumps on the buttocks are usually folliculitis, not acne.
- Sweat, friction, tight clothing, prolonged sitting and hair removal are the main triggers.
- Daily habits (showering after sweating, breathable underwear, no picking) prevent most flares.
- Deep, painful or recurring lumps can be something else and should be checked.
What causes folliculitis on the buttocks
Folliculitis has several causes. Some are mechanical irritation, some are bacterial, and some are fungal. On the buttocks, the common triggers are:
- Sweat and workouts. Cleveland Clinic points to sweating as a major cause, especially when people stay in damp workout clothes or uniforms.
- Friction from tight clothing. The AAD notes that tight clothing rubbing against the skin can injure hair follicles. Thongs and nonbreathable fabrics add friction exactly where follicles are most exposed.
- Long hours of sitting. Cleveland Clinic lists prolonged sitting as a cause, since pressure, heat and trapped sweat combine.
- Hair removal. Shaving, waxing and plucking can all irritate follicles. DermNet describes an irritant type of folliculitis that follows hair removal. Our article on razor bumps vs. razor burn explains the related problem of hairs growing back into the skin.
- Hot tubs. Hot tub folliculitis is caused by bacteria that thrive in poorly maintained warm water. Cleveland Clinic notes the rash often appears on skin covered by a swimsuit, including the buttocks, a few days after exposure.
- Heavy, occlusive products. DermNet lists thick ointments and moisturizers as possible triggers because they can block follicles.
Other causes of bumps on the buttocks
Not every bump on the buttocks is folliculitis. Several look-alikes behave very differently, and a few need medical care.
| Condition | What it typically looks like | What sets it apart |
|---|---|---|
| Folliculitis | Small, sometimes pus-filled bumps around hairs | Linked to sweat, friction or hair removal; comes in clusters |
| Keratosis pilaris | Rough, dry, pinpoint bumps | Feels like sandpaper; rarely inflamed; often also on arms and thighs |
| Boil | A single, larger, painful red lump that fills with pus | A deep form of folliculitis; may need drainage by a clinician |
| Hidradenitis suppurativa | Recurring deep, tender lumps in skin folds | Returns in the same places; can form tunnels and scars |
| Pilonidal sinus | Pain and swelling at the top of the buttock crease | Located in the cleft, not on the cheeks |
Keratosis pilaris commonly appears on the buttocks in teens and adults, according to the AAD. It is harmless and responds to moisturizing rather than drying washes. A boil, by contrast, is a deep folliculitis caused by staph bacteria, Cleveland Clinic explains.
Hidradenitis suppurativa (HS) is worth knowing about because it is often mistaken for boils or acne. The AAD describes breakouts that look like pimples or boils in areas such as the buttocks, groin, inner thighs and armpits, which tend to return in the same spots and can lead to tunnels under the skin and scarring. The AAD advises seeing a board-certified dermatologist if you have a tender, deep lump in these areas. A pilonidal sinus, as the NHS describes, is a small hole or tunnel at the top of the buttock crease that can become infected and painful.
Everyday prevention habits
Because the triggers are mostly about heat, moisture and friction, prevention is mostly about habits. These come straight from AAD and Cleveland Clinic advice:
- Shower soon after sweating. Cleveland Clinic advises getting in the shower right after a workout. If you can’t, change out of sweaty clothes as soon as possible.
- Choose breathable underwear. Cotton or other breathable fabrics are a better default than synthetic, tight-fitting styles. Cleveland Clinic suggests avoiding thongs if you’re prone to bumps.
- Wear looser clothing in heat. The AAD recommends loose clothing when it’s hot and humid.
- Take breaks from sitting. Standing up periodically reduces the heat and pressure that build when you sit for hours.
- Wash gently. A mild cleanser is enough for most people. Cleveland Clinic suggests cleansers with salicylic acid for people prone to breakouts. Skip rough scrubbing, which adds friction to irritated follicles. If texture is the main complaint, a gentle acid works better than a scrub; see our guide to choosing an acid for body bumps.
- Use lighter moisturizers. Choose noncomedogenic formulas over thick, greasy ones on this area.
- Treat hot tubs with caution. Cleveland Clinic recommends showering and removing your swimsuit right after using a hot tub, washing the suit before wearing it again, and not shaving just before getting in.
Managing a mild flare at home
Removing the trigger comes first: the sweaty leggings, the tight seams, the razor. For comfort, the AAD suggests applying a warm compress three to four times a day for 15 to 20 minutes at a time. If shaving, waxing or plucking set off the bumps, the AAD advises stopping hair removal for 30 days.
Resist the urge to squeeze. Cleveland Clinic warns that picking only makes the skin more irritated, and on darker skin every inflamed bump is a chance for a lingering dark mark. Hot tub folliculitis typically clears within one to two weeks without treatment.
When to see a dermatologist
A dermatologist can confirm that the bumps are folliculitis and not one of its look-alikes, and can prescribe medicine if an infection needs treatment, the AAD notes. Because bacterial, fungal and irritant folliculitis need different approaches, a diagnosis saves you from trying the wrong thing for months. For a broader checklist, see when skin bumps need a dermatologist.
See a board-certified dermatologist if
- You have a deep, tender lump, or lumps that keep returning in the same places.
- Redness is spreading, the area feels hot, or you have a fever or feel unwell.
- A bump is large, very painful or draining pus.
- You have pain, swelling or drainage at the top of the buttock crease.
- Bumps haven’t improved after two weeks of home care, or keep coming back.
- You have diabetes or a weakened immune system, both of which are linked to recurrent folliculitis.
Frequently asked questions
Is butt acne actually acne?
Usually not. Cleveland Clinic notes that true acne on the buttocks is rare and that most bumps there are folliculitis, keratosis pilaris or, less often, boils. The difference matters because they respond to different care.
How long does folliculitis on the butt last?
It depends on the cause. Hot tub folliculitis usually clears within one to two weeks, and DermNet notes it generally resolves within 14 days. Friction-related bumps tend to calm once the trigger is gone. Bumps that persist longer, worsen or keep returning should be checked.
Can sitting all day cause folliculitis?
Prolonged sitting is one of the causes Cleveland Clinic lists. Heat, pressure and trapped sweat irritate follicles. Standing up regularly and wearing breathable fabrics help.
Should I shave or wax if I have folliculitis on my butt?
Pause hair removal while you have a flare. The AAD recommends stopping shaving, waxing or plucking for 30 days if hair removal triggered the bumps.
Is folliculitis on the buttocks contagious?
Folliculitis caused by friction or hair removal isn’t an infection. Bacterial folliculitis is different: for staph infections, DermNet advises against sharing clothing and towels and recommends hot-washing towels and bedding (DermNet). Keep your towels and razors to yourself during a flare, and see a doctor if bumps spread.
Sources
- American Academy of Dermatology. “Acne-like breakouts could be folliculitis.” AAD.org. source
- American Academy of Dermatology. “Hidradenitis suppurativa: Signs and symptoms.” AAD.org. source
- American Academy of Dermatology. “Keratosis pilaris: Signs and symptoms.” AAD.org. source
- Cleveland Clinic. “Butt acne: causes, treatment and prevention.” Cleveland Clinic Health Essentials. source
- Cleveland Clinic. “Hot tub folliculitis.” Cleveland Clinic Health Library. source
- DermNet. “Folliculitis.” DermNet NZ. source
- DermNet. “Folliculitis and furunculosis.” DermNet NZ. source
- DermNet. “Spa pool folliculitis.” DermNet NZ. source
- Cleveland Clinic. “Folliculitis.” Cleveland Clinic Health Library. source
- NHS. “Pilonidal sinus.” nhs.uk. source
This article is for general information and isn’t a substitute for professional medical advice, diagnosis or treatment.