Folliculitis or acne? How to tell body bumps apart

Folliculitis and body acne are easy to confuse. Both cause red bumps and pus-filled spots on the chest, back, shoulders, buttocks and thighs. They start in the same place, the hair follicle, which is the small opening in the skin each hair grows from. But they have different causes, and a treatment that suits one can miss or even worsen the other. This guide lays out the clues that point to each, what helps, and when a doctor needs to decide. It is part of Skinli's guide to body acne.

Skinli gives general education, and it is not a doctor. Only a doctor can diagnose folliculitis, and the clues below help you describe what you see.

Two different problems in the same follicle

Acne begins with a clog. NIAMS, part of the US National Institutes of Health, explains that oil and dead skin cells plug the pore, bacteria that normally live on the skin grow in the plug, and the area swells. The early stages are blackheads and whiteheads, which doctors call comedones.

Folliculitis begins with damage or infection. MedlinePlus says it "starts when hair follicles are damaged or when the follicle is blocked," for example by rubbing against clothing or shaving, and that "most of the time, the damaged follicles become infected with staphylococci (staph) bacteria." The American Academy of Dermatology (AAD) calls it "a common skin infection that develops in the hair follicles" and says it can appear anywhere except the palms and soles. A yeast called Malassezia can cause a form of folliculitis too, often called fungal acne.

Side by side

A 2025 review in the Journal of Fungi compares the three conditions people mix up most:

Feature	Acne	Bacterial folliculitis	Fungal folliculitis (fungal acne)
Spots	Mixed: blackheads, whiteheads, pimples	Red pus bumps	Small bumps and pus bumps that all look the same
Blackheads and whiteheads	Present	Absent	Absent
Itch	Mild or absent	Mild to moderate	Common and often intense
Where	Face, chest, back	Often one area, such as the scalp or legs	Upper trunk, shoulders, face
What helps	Standard acne treatment	Antibiotics, which work quickly	Antifungals. Antibiotics do not help

Two more clues from the AAD: folliculitis "usually looks like a sudden acne breakout," and "each spot may have a red ring around it, which is a sign of the infection."

Clues that point to folliculitis

The AAD lists common causes. If one of these came right before your bumps, folliculitis becomes more likely:

• A hot tub or whirlpool that is not well kept. The AAD says spots tend to appear on skin covered by the swimsuit, 12 to 48 hours after use. This is called hot tub folliculitis.
• Shaving, plucking or waxing.
• Tight clothing or equipment, especially on a hot day. The AAD's example is tight clothing rubbing during a bike ride in the heat.
• Skin rubbing against skin, such as the inner thighs.
• A medicine put on the skin, such as coal tar, or a medicine taken by mouth.
• Weight gain.

The AAD's page on bumps in children adds that folliculitis bumps "tend to form on skin covered by clothing, such as the buttocks or thighs." Butt acne covers that area in detail.

Clues that point to acne

• Blackheads and whiteheads mixed in with the red spots. The 2025 review lists them as present in acne and absent in both kinds of folliculitis.
• Spots of many types. The review describes acne as polymorphic, meaning it mixes several kinds of spots, and fungal folliculitis as monomorphic, meaning the bumps all look the same.
• Acne on your face at the same time. In a 2026 UK study of acne patients, 1.7% had acne only on the trunk, and 61.9% had it on both the face and the trunk.

The back acne guide and chest acne guide cover treatment for acne in those areas.

Clues that point to fungal acne

The 2025 review describes fungal acne as small, itchy bumps, 1 to 2 millimeters across, that all look alike, on the upper trunk, chest, back, shoulders and face. In one case series it cites, people had it for an average of 61 months before diagnosis. In one study it cites, 75% of 110 patients with confirmed fungal acne had first been treated for ordinary acne without success. The review says antibiotics "are almost always ineffective and may worsen" it. See fungal acne.

Other look-alikes

Condition	How it differs
Keratosis pilaris	Rough, dry bumps, like goosebumps, on the upper arms and front of the thighs. The AAD says they are plugs of dead skin cells
Razor bumps	Curly hairs cut short curve back into the skin, MedlinePlus says. They follow the shaved area, including the back of the neck
Heat rash	Small, itchy, prickly spots after heavy sweating, which the NHS says usually settle in a few days. See sweat and body acne
Boils	A hard, painful lump that fills with pus, the NHS says. Many together are called a carbuncle
Hidradenitis suppurativa	Deep, painful lumps where skin touches skin that return in the same place, the AAD says

How a doctor tells them apart

MedlinePlus says a doctor can usually diagnose folliculitis by looking at the skin, and that "lab tests may show which bacteria or fungus is causing the infection." The 2025 review lists the tools doctors use for fungal folliculitis:

• A skin scraping under a microscope. The doctor scrapes material from the surface of a bump onto a glass slide and adds a liquid that dissolves skin cells, so any yeast can be seen. The review calls this the most accessible and lowest-cost test.
• A lighted magnifier held on the skin, which can show scale and other small signs.
• An ultraviolet lamp, under which fungal bumps may glow yellow-green.
• A small skin sample, or biopsy, examined in a lab when the answer is still unclear.

These tests matter because the treatments differ. An antibiotic that suits bacterial folliculitis will not clear fungal folliculitis, and acne needs its own treatment plan.

What helps folliculitis

The AAD says the bumps tend to go away on their own if you have a healthy immune system and you stop doing what caused them. To heal faster and feel better, it suggests warm compresses:

1. Apply a warm compress at least 3 to 4 times a day.
2. Leave it on for 15 to 20 minutes each time.
3. You can use it more often if it helps.

If shaving, plucking or waxing caused it, the AAD suggests stopping for 30 days. MedlinePlus adds: reduce friction from clothing, avoid shaving the area if you can, and when you must shave, use a clean, new blade or an electric razor each time. Keep the area clean, and avoid dirty clothing and washcloths.

To prevent it, the AAD suggests loose clothing in hot, humid weather, changing out of tight workout clothes and showering soon after exercise, washing your swimsuit after each use and letting it dry, and skipping hot tubs if you are unsure they are well kept.

Some people use benzoyl peroxide on folliculitis. Skinli's guide to benzoyl peroxide for folliculitis sets out what the evidence does and does not show.

When a doctor is needed

The AAD says a board-certified dermatologist can tell you whether you have folliculitis, because infected follicles "can look like another skin condition, such as acne," and that "some people need medication, such as an antibiotic, to clear the folliculitis." MedlinePlus says treatment may include antibiotics applied to the skin or taken by mouth, or an antifungal medicine. A doctor can test a sample from a bump to find the germ.

The evidence on which treatment works best is limited. A 2021 Cochrane review, which gathers every good trial it can find, included 18 trials with 1,300 people with bacterial folliculitis or boils. Most of those trials compared one antibiotic pill with another, and the review found no trials comparing antibiotic creams with pills. It also says some folliculitis clears on its own while some can progress to boils without treatment.

See a doctor if:

• The bumps come back often, get worse, or last longer than 2 or 3 days of home care, as MedlinePlus advises.
• A lump becomes hard, hot, swollen and painful, or you feel hot, cold or shivery. The NHS says to get an urgent appointment for a boil with these signs.
• The bumps itch and look alike, which can point to fungal acne.
• You have deep, painful lumps that return in skin folds.

Skinli's free acne plan is built for acne on the face from a photo, and it cannot tell folliculitis from acne on the body.