Blackheads on your back: why and what helps

Blackheads on the back are the same plugged pores that form on the nose: oil and dead skin cells packed into a pore that stays open, with a dark top where the plug meets air. The back adds its own reasons for clogging. Sweat sits under clothes, straps and seats rub the skin, and shampoo runs down it in the shower. The back is also hard to see and reach, and a 2025 study says acne there is often overlooked. This guide explains why they form on the back, how to treat them, and what to leave out of your routine. For blackheads anywhere, start with the hub guide, how to get rid of blackheads.

What blackheads on the back are

The American Academy of Dermatology (AAD) says a blackhead "develops when excess oil and dead skin cells build up inside a pore. As the buildup accumulates, it widens the opening of the pore and you see a blackhead." Its medical name is open comedo. The guide what causes blackheads covers how the plug forms.

A 2025 study in the Journal of Cosmetic Dermatology says blackheads typically appear on the face, most of all on the nose, and may also develop on the back, chest, neck, arms and shoulders. MedlinePlus says acne "commonly appears on the face and shoulders" and "may also occur on the trunk, arms, legs, and buttocks." The trunk is the chest, back and belly together.

Acne on the back is common. A 2025 study in the Journal of Cutaneous Medicine and Surgery looked at 545 people aged 12 and older with acne. Its authors wrote that truncal acne "is often overlooked, although it is as common as facial acne." They found the upper back, the lower back and the shoulders were the most common places on the trunk. They advised doctors to examine the back, chest and shoulders whenever they assess acne.

Why the back gets blackheads

The sources name several reasons that apply to the back:

• Sweat trapped by clothing. MedlinePlus lists "heavy sweating and humidity" as acne triggers. The AAD's back acne page advises showering and changing clothes soon after sweating.
• Rubbing and pressure. The AAD says anything that rubs your back, such as a backpack, "can irritate your skin, causing back acne to flare." Its page on sports equipment calls this acne mechanica and lists backpack straps, the back of a driver's seat and the plastic on weightlifting benches as common causes.
• Hair products. The AAD says oils in hair products can cause breakouts along the hairline and on "the back of your neck." Conditioner and styling products rinse down over the upper back.
• Oily body products. The AAD advises skin care and sunscreen labeled "non-comedogenic," "non-acnegenic," "won't clog pores" or "oil-free."

Blackheads or fungal acne?

Some bumps on the back have a different cause: yeast. A 2025 review in the Journal of Fungi, written by dermatologists, describes Malassezia folliculitis, often called fungal acne. It is caused by yeast in the hair follicles. The review says it causes small, itchy bumps of the same size, most often on "the upper trunk, chest, back, shoulders, and face." It says "A hallmark feature distinguishing MF from AV is the absence of comedones," where MF is fungal acne and AV is ordinary acne.

So blackheads on your back are a sign of ordinary acne. If your back has itchy bumps that all look alike and no blackheads, and acne treatment has not helped, see a dermatologist. The guide fungal acne covers that condition.

A treatment plan for the back

The AAD says you may be able to treat back acne yourself if you have "a mix of whiteheads, blackheads, and pimples on your back, but nothing that's painful or goes deep into the skin." It recommends two products sold without a prescription.

1. A benzoyl peroxide wash, left on for two to five minutes. The AAD says "Studies show that benzoyl peroxide works best if left on the back for two to five minutes." Leaving it on helps the medicine get into the skin, because "Skin is thicker on the back than on the face." Rinsing it off afterward protects fabric, because benzoyl peroxide bleaches. The FDA requires benzoyl peroxide labels to warn users to avoid contact with "hair and dyed fabrics, which may be bleached by this product." The AAD says a 5.3 percent wash "is less likely to cause irritated skin, dryness, or peeling," and that 10 percent is the strongest you can buy without a prescription.

2. Adapalene 0.1 percent gel, once a day. The AAD says using adapalene along with benzoyl peroxide "can improve your results," because it "can help unclog pores, which will help the benzoyl peroxide work better." It advises applying adapalene "after you shower or before going to bed," every day.

Getting it on your back. The AAD says "For treatment to work, you must get it on your back," and suggests a lotion applicator made for the back.

Salicylic acid is an option for acne caused by rubbing. The AAD's sports equipment page says an acne medicine with salicylic acid "often works well to clear this type of acne."

How long it takes

The AAD's back acne page says "you may start to see results in six to eight weeks. Complete clearing can take three or four months."

Habits that help your back clear

The AAD lists these habits for people with back acne:

1. Wear loose-fitting workout clothes made of cotton or sweat-wicking fabric.
2. Wash workout clothes after each use.
3. Shower and change clothes as soon as you can after sweating. If you cannot shower, use an oil-free cleansing wipe.
4. Carry a handheld bag instead of a backpack, and move a shoulder strap to your arm.
5. Put clean, soft padding between sports equipment and your skin.
6. Use a sunscreen labeled non-comedogenic, SPF 30, broad-spectrum and water resistant on skin that clothes do not cover. The AAD says the sun can darken acne and make it last longer.

What to skip

• Scrubbers and harsh products. The AAD says "Antibacterial soaps, astringents, and abrasive scrubs can worsen acne. Ditto for loofahs, back brushes, and buff puffs." Astringents are drying liquids, often made with alcohol, used to take oil off the skin.
• Picking. The AAD says "Resist the temptation to pick and pop acne, even on your back. This will only worsen acne."
• Rough towel drying. The AAD says to pat sweat away gently with a clean towel.

One large blackhead on the back

A single dark pore on the back that is larger than the rest may be something else.

A dilated pore of Winer. A StatPearls review describes it as "an asymptomatic, solitary, enlarged pore with a keratin plug and normal surrounding skin." It says the condition is most common on the head and neck and "can also be found on the trunk of middle-aged and older individuals." It is harmless, and a doctor can remove it by cutting it out.

An epidermoid cyst. MedlinePlus says this lump is "usually found on the face, neck, and trunk" and "will often have a tiny hole or pit in the center." It should be checked if it turns red or painful.

The NHS says not to squeeze a skin cyst, because it could become infected if it bursts. A dermatologist can remove both. The guide how a dermatologist removes blackheads explains the options. Blackheads in other hard-to-see places, such as the ears, are covered in blackheads in the ear.

Keep them from coming back

Back blackheads can return once you stop treating them. The AAD says a benzoyl peroxide wash "Used daily, it can help control back acne and reduce flares." Its page on acne that will not clear adds: "Even when you see clearing, you'll want to keep using the acne treatment. This helps to prevent new breakouts." Keep the wash in your shower and keep the sweat habits above. If rubbing from a strap or a bench caused the problem, the AAD says acne mechanica "tends to clear more quickly than regular acne."

When to see a dermatologist

The AAD says: "Anyone who has deep, painful acne on their back (or anywhere else) will need a dermatologist's help." It adds: "If you don't see any difference in six to eight weeks, you may need a dermatologist's help." See a dermatologist sooner for itchy bumps with no blackheads, a lump that grows or hurts, or acne that leaves marks or scars. The guide how to get rid of back acne covers red pimples on the back in more depth. Skinli gives general education and is not a doctor. Skinli's free acne plan builds a routine from a photo of your face.