Bumps on Your Buttocks: Is It Acne or Folliculitis?

Small bumps on the buttocks often aren't the same thing as facial acne. In many cases, they're folliculitis, an inflammation of the hair follicles, or keratosis pilaris, where dead skin plugs the follicle openings. Many people notice more red bumps after sitting for long hours or sweating in workout clothes, feel a rough texture when they run a hand over the skin, and find that their facial acne cream doesn't change anything.

This article explains why buttock bumps behave differently from acne, how to tell folliculitis, keratosis pilaris and hidradenitis suppurativa apart by how they look and feel, why care depends on the cause, and which signs mean you shouldn't wait to get checked.

Why buttock bumps should be looked at differently from acne

Why buttock bumps should be looked at differently from acne

Folliculitis means inflammation of the hair follicle, the tiny pocket where a hair grows, whatever the cause. It can appear anywhere hair grows, and the buttocks are one of the common spots. It usually looks like a red bump with a small spot of pus in the center, which is why it's easy to confuse with acne.

DermNet groups acne itself under the broad family of follicle inflammation. So rather than asking "Is this acne or not?", it's more useful to figure out what's irritating the follicles. The most common cause is bacteria that live on the skin, such as Staphylococcus aureus. Hair growing back after shaving or waxing, heavy ointments or moisturizers that cover the skin, and hot tubs can also trigger it.

The buttocks get pressed when you sit for long periods, rubbed by underwear and clothing, and stay damp with sweat. These conditions make it easy for follicles to get blocked and irritated, which is why facial acne care alone often doesn't settle bumps here.

Hair follicle: a tiny pocket in the skin where a hair grows. When its opening gets blocked or inflamed, it rises into a small bump.

How folliculitis, keratosis pilaris and hidradenitis suppurativa differ

How folliculitis, keratosis pilaris and hidradenitis suppurativa differ

You can roughly sort buttock bumps by how they feel to the touch and how much they hurt. Some people have more than one type at the same time.

Keratosis pilaris is made of small bumps where dead skin plugs the follicles. It looks like goosebumps and feels rough like sandpaper. According to DermNet, it's so common that it affects 50 to 70% of teenagers and about 40% of adults. It shows up most on the upper arms and outer thighs, but it can appear on the buttocks too. It isn't an infection, so it doesn't spread to others, and it rarely causes pus or pain, which sets it apart from folliculitis.

If the area feels rough but doesn't hurt, keratosis pilaris is more likely. If each bump is red, tender and shows pus, it's closer to folliculitis. If deep lumps keep rupturing and scarring in skin-to-skin areas like the armpits, groin or buttocks, hidradenitis suppurativa should be considered.

How folliculitis, keratosis pilaris and hidradenitis suppurativa differ

Why care changes depending on the cause

Why care changes depending on the cause

Bacterial folliculitis is managed by keeping the skin clean, using antiseptic washes or creams, and, when needed, antibiotic ointment or oral antibiotics. The story is different when yeast (Malassezia) is the cause. Yeast folliculitis shows up as small, evenly sized itchy bumps without the blackheads typical of acne, and it mostly appears on the back and chest. Hot, humid weather, sweat, moisturizers that cover the skin, and taking antibiotics can all set it off, so antibiotics may actually be the wrong fit.

When yeast is behind it, the usual approach is to stop covering moisturizers and antibiotics and use an antifungal for several weeks. It often comes back even after treatment works, so reducing the triggers, such as sweat and moisture, matters just as much.

Keratosis pilaris isn't an infection, so antiseptics and antibiotics won't improve it. The basic approach is to apply a moisturizer with ingredients that loosen dead skin or add moisture, such as urea, lactic acid or salicylic acid, on a regular basis. It tends to get worse in dry winter months. There's no way to make it go away completely, but it often fades with age.

Why care changes depending on the cause

For folliculitis caused by hair removal, DermNet suggests stopping hair removal and waiting about three months after it settles before starting again. When buttock folliculitis keeps coming back over a long time, laser hair reduction is sometimes considered to reduce the hair itself.

What to prepare before your visit to STON Clinic

What to prepare before your visit to STON Clinic

The look of the bumps alone doesn't always reveal the cause, so an exam usually covers when they started, whether they itch or hurt, any recent antibiotics or hair removal, and daily habits that trap sweat. If needed, a swab of the pus may be taken to check which germ is involved.

At home, start by not staying in damp workout clothes after sweating, avoiding very tight clothing, and not squeezing or picking at the bumps. Squeezing can push the inflammation deeper, turning a bump into a boil or leaving a mark.

If you notice any of the following signs, don't wait; get medical care right away.

• Fever or chills, with redness spreading around the area
• A painful, firm lump that's growing quickly or filling with pus
• Deep lumps that keep rupturing and healing in the same spot

At a consultation, starting with "Are my buttock bumps closer to bacterial folliculitis, yeast folliculitis or keratosis pilaris?" makes the care plan easier to understand. When you contact the clinic, mention when the bumps started, whether they itch or hurt, any medication you've taken recently, and the products you've tried so far.