Shoulder acne: what causes it and how to treat it

Shoulder acne is acne that forms on the tops and backs of the shoulders. It is the same condition as acne on the face, in a place where bag straps, sports pads, sweat and shirts press on the skin all day. The American Academy of Dermatology says that "anywhere that equipment rubs, acne can appear," so shoulder acne can show up right where a strap or pad sits. This guide covers what causes it, how to treat it, what the bumps might be if they are not acne, and when to see a doctor. It is part of Skinli's guide to body acne.

Skinli gives general education, and it is not a doctor. Deep, painful lumps on the shoulders need a dermatologist.

How common it is

NIAMS, part of the US National Institutes of Health, says acne outbreaks happen most often on the face "but can also appear on the back, chest, and shoulders." Acne on the trunk, meaning the chest, back and shoulders, is common among people with acne:

• A 2026 study of 2,038 acne patients at a UK hospital found 63.6% had acne on the trunk, alone or with facial acne.
• A 2025 study of 545 acne patients in Turkey found the upper back, the whole back and the shoulders were the most common places for acne on the trunk.

Both studies looked at people who came to a skin clinic, so they describe people with enough acne to seek care.

What causes shoulder acne

The process inside the pore is the same as on the face. NIAMS names three things that lead to acne: too much oil, a buildup of dead skin cells, and bacteria that grow in the plugged pore. Hormones called androgens, which rise in both boys and girls at puberty, make oil glands larger. NIAMS says acne is most common in teens and young adults, and that in the teenage years it is more common in males.

Then the shoulders add their own triggers.

Pressure and rubbing

NIAMS lists "pressure from sports helmets, tight clothes, or backpacks" as things that can make acne worse. The American Academy of Dermatology (AAD) calls acne from gear and clothing acne mechanica. It forms when equipment or clothing "traps heat and sweat on your skin" and rubs it. The AAD's list of gear that causes it includes several things that sit on the shoulders:

• Backpack straps
• Football and lacrosse shoulder pads
• The strap on a golf bag
• Weightlifting benches and belts

The AAD's back acne page adds shoulder bags. It suggests placing a purse strap on your arm instead of your shoulder. For more on this cause, see acne from backpacks and tight clothes.

Sweat and heat

The AAD says working out can cause heavy sweating and "a buildup of oil, dirt, and bacteria on your skin," all of which can lead to acne. It recommends showering soon after a workout and wearing clean workout clothes each time. Sweat and body acne looks at what the research says about sweat itself.

Medicines and steroids

NIAMS says medicines that contain hormones, corticosteroids or lithium can cause acne. The UK's NICE acne guideline tells doctors to consider specialist care when a medicine, "including self-administered anabolic steroids," may be driving a person's acne. A 2007 review from Germany estimated that acne occurs in 50% of people who misuse anabolic steroids and called it an important warning sign, especially in men aged 18 to 26. If acne on your shoulders and chest started after a new medicine or supplement, tell your doctor what you take.

How to treat shoulder acne

The shoulders are part of the back, so the AAD's back acne steps apply:

1. A benzoyl peroxide wash, left on. The AAD names a benzoyl peroxide foam wash first. It says "studies show that benzoyl peroxide works best if left on the back for two to five minutes," because back skin is thicker than face skin. It says 5.3% is less likely to cause dryness or peeling than 10%. See acne body wash.
2. Adapalene gel after the shower. The AAD suggests adapalene 0.1% gel, a retinoid sold without a prescription, applied daily after a shower or at bedtime, to unclog pores.
3. Salicylic acid for rubbing. For small rough bumps under straps and pads, the AAD says a salicylic acid product "often works well." A body acne spray with salicylic acid can reach the back of the shoulder.
4. Cover the whole area. Spread the medicine over all the skin that breaks out, including skin that looks clear today.
5. Give it time. The AAD says results may start in six to eight weeks, and complete clearing can take three or four months.

Benzoyl peroxide bleaches fabric, so let it rinse fully before you put on a shirt. Shirt collars and bra straps sit right on the shoulders.

Habits that help the shoulders

These come from the AAD's pages on back acne, workouts and sports gear:

• Move the strap. The AAD suggests a handheld bag in place of a backpack, and carrying a shoulder bag with the strap on your arm.
• Pad the gear. The AAD suggests placing "clean, soft padding between the equipment and your skin."
• Wear loose, sweat-wicking clothes when you work out, and wash them after each use.
• Shower soon after you sweat. If you cannot, the AAD suggests changing clothes and wiping the area with a salicylic acid pad.
• Keep shared gear clean. The AAD says shared helmets and shoulder pads "can be full of acne-causing bacteria and oil." It suggests not sharing protective gear when you can avoid it, and wiping off shared equipment before you use it.
• Wear clothes washed since you last wore them. The AAD says dead skin cells, bacteria and oils on unwashed clothes can clog pores.
• Pat, do not rub. The AAD says rubbing sweat off with a towel can make acne flare.
• Wear sunscreen on bare shoulders. The AAD says the sun's rays "tend to darken acne and cause it to last longer," and advises an oil-free, SPF 30, broad-spectrum, water resistant sunscreen.
• Rinse off hair products. Conditioner and styling products run over the shoulders in the shower. See hair products and back acne.
• Leave the spots alone. Picking and popping make acne worse, the AAD says, even on the back.

When shoulder bumps are something else

Several conditions that look like acne like to sit on the shoulders and upper arms:

Condition	What it looks like	What helps
Fungal acne	Small, itchy bumps that all look the same, on the upper trunk and shoulders, with no blackheads	Antifungal treatment from a doctor. See fungal acne
Keratosis pilaris	Tiny, rough bumps like goosebumps, most often on the upper arms and front of the thighs	Moisturizer and gentle exfoliation. See acne on arms and thighs
Folliculitis	Sudden spots, each with a red ring, often after tight clothes, heat or a hot tub	Removing the cause, warm compresses, sometimes an antibiotic. See body acne or folliculitis

A 2025 review of fungal acne says it usually shows as itchy, same-size bumps on the upper trunk, chest, back and shoulders, and that antibiotics taken for acne almost never help it. The AAD says keratosis pilaris bumps are "plugs of dead skin cells" that people often mistake for small pimples.

Scars and dark marks

Shoulder acne can leave marks. A 2026 review of acne on the trunk says scars there are most likely "on the shoulders and upper chest," and that dark marks after acne are more frequent and last longer on the trunk. The AAD says flat dark spots usually fade over time, while a true scar remains. It says you may lower your risk of scars by treating acne when you first notice it and by never picking, popping or squeezing it. The back acne scars guide covers treatment for scars that are already there.

When to see a doctor

See a dermatologist if:

• The spots are deep and painful. The AAD says anyone with deep, painful acne on the back needs a dermatologist's help. See cystic back acne.
• You see no change after six to eight weeks of treatment.
• Your face has cleared but your back or chest has not. The AAD lists this as a reason to see a dermatologist.
• The acne started after a new medicine or supplement.
• The bumps itch or all look alike, which points toward fungal acne.

Skinli's free acne plan builds a routine for acne on the face from a photo. For the shoulders, the steps above and the rest of the back acne guide are the place to start.