Not every red or rough bump on your body is acne. Body acne, folliculitis, and keratosis pilaris can have a very similar appearance, especially on the arms, thighs, chest, back, shoulders, or buttocks.
I understand how upsetting body acne can be because mine was always the worst on my back. It became so inflamed that I would come home from school with little blood marks on the back of my shirt. I would not wear a tank top, and I wore a T-shirt over my swimsuit because I was embarrassed for anyone to see my skin.
At 45 years old, I still use treatments on my back to keep it clear. When I talk to you about body acne, I am speaking from experience. I know it can affect what you wear, how you feel in a swimsuit, and how comfortable you are letting someone see your skin.
The first step is figuring out what kind of bumps you have. These skin conditions develop for different reasons, so the right treatment plans depend on an accurate diagnosis.
What Is Body Acne?
Acne vulgaris is an inflammatory condition involving the pores, sebaceous glands, and hair follicles. It is the most common skin condition and can appear anywhere your body produces oil.
Body acne usually involves:
- Overproduction of sebum
- A buildup of dead skin cells
- Blocked hair follicles
- Acne-related bacteria
- Sweat, friction, and tight clothing
People with naturally oily skin may be more prone to it, although anyone can develop body acne.
Body acne often includes different types of bumps at once, including blackheads, clogged pores, inflamed pimples, and pus-filled bumps. This mixture is one of the biggest differences between acne and folliculitis.
You can learn more in this review of acne development and treatment and this research review of acne vulgaris.
For back and chest acne, the Skin+ BP Active Wash can be applied in the shower and left on the affected areas for one to two minutes before rinsing.
After showering, the Skin+ AHA 15% Back & Body Serum helps exfoliate the skin’s surface and reduce buildup around the follicles.
What Is Folliculitis?
Folliculitis means inflammation of the hair follicle. It can occur anywhere hair grows and often appears as a group of matching red bumps centered around individual hairs.
Possible causes include:
- Sweat and friction
- Tight clothing
- Shaving or waxing
- Ingrown hairs
- Occlusive products
- Yeast
- A bacterial infection
Bacterial folliculitis is commonly associated with staph bacteria. More serious cases can develop into boils or deeper staph infections and may require medical care or oral antibiotics.
Folliculitis usually produces many similar-looking bumps. Body acne tends to include a combination of blackheads, congestion, small bumps, and inflamed lesions.
Avoid applying random steroid creams to unexplained skin bumps. Steroids can hide or worsen some infections and may aggravate other conditions, including perioral dermatitis.
What Is Malassezia Folliculitis?
Malassezia folliculitis is caused by an overgrowth of yeast inside the follicles. It often appears on the chest, shoulders, upper back, neck, and hairline.
The bumps are usually small, uniform, itchy, and centered around the follicles. It is sometimes called fungal acne, although it is not true acne vulgaris.
We see a lot of Malassezia folliculitis in the Skin+ clinic here in Austin, Texas. Our hot, humid weather creates an environment where sweat, oil, and heat remain trapped against the skin. Research has also identified high temperature, humidity, sweat, and clothing as factors that can contribute to Malassezia folliculitis.
One of the simplest things you can do is get out of sweaty, tight clothing as soon as possible. Do not sit for hours in a damp sports bra, fitted workout shirt, or leggings. Shower when you can and change into clean, dry, loose-fitting clothing.
Can Acids and Calm Reset Help Malassezia?
In the Skin+ clinic, we have seen a reduction in folliculitis-like bumps when clients consistently use an appropriate acid.
Mandelic acid may help by clearing dead skin from the follicular opening and reducing congestion. This can be especially useful when someone has both acne and uniform folliculitis-like bumps.
Glycolic acid can also smooth follicular buildup. The Skin+ G-10 10% Glycolic Acid Skin Renewal Complex is another option for rough texture and clogged follicles.
Skin+ Calm Reset may also be a helpful supportive step. It contains hypochlorous acid, which helps cleanse the skin’s surface and calm visible irritation. I especially like it after sweating, working out, or being outside in Austin heat when you cannot immediately shower.
Current research has not established mandelic acid, glycolic acid, or hypochlorous acid as primary antifungal treatments for Malassezia folliculitis. Persistent or confirmed cases may still require antifungal treatment. I use these products to help manage sweat, irritation, dead skin buildup, and overlapping acne—not as replacements for appropriate medical care.
What Is Keratosis Pilaris?
Keratosis pilaris is a common, harmless skin condition often called chicken skin. It most commonly appears on the upper arms, backs of the arms, thighs, buttocks, or cheeks.
The cause of keratosis pilaris is a buildup of keratin and dead skin around the follicular openings. The bumps may appear white, pink, red, brown, or darker than the surrounding skin. On white skin, they often look pink or red.
Some people call this strawberry skin, although that term can also describe shaving irritation, trapped hairs, or ingrown hairs.
Keratosis pilaris often worsens during the winter months because of dry skin. The good news is that it is harmless, although it may last a long time and usually requires consistent care.
Can Acids Improve Keratosis Pilaris?
Yes. Chemical exfoliants have good evidence for reducing the appearance of the bumps.
One study compared 10% lactic acid with 5% salicylic acid. After 12 weeks, lactic acid produced approximately a 66% reduction in the bumps, while salicylic acid produced approximately a 52% reduction.
Read the study: Lactic acid and salicylic acid for keratosis pilaris.
Glycolic acid, one of the alpha hydroxy acids, has also been studied. Professional-strength treatments reduced keratotic bumps by more than 50% and improved redness and discoloration.
Read the study: Glycolic acid treatment for keratosis pilaris.
Another small study found improvement when a glycolic and salicylic acid serum was used by people with folliculitis, keratosis pilaris, acne, and rosacea.
Read the study: Glycolic and salicylic acid serum study.
These results match what we see with Skin+ clients. Lactic acid helps soften dry skin, glycolic acid smooths the skin surface, and salicylic acid is a beta hydroxy acid that works inside oily follicles.
When Should You Seek Medical Care?
Seek medical care when bumps become hot, painful, rapidly spread, repeatedly drain, or fail to improve.
A spot that bleeds, crusts, changes, or refuses to heal should not automatically be treated as acne. Some forms of skin cancer, including basal cell carcinoma, can resemble a recurring sore or unusual bump.
I spent years hiding my back, so I understand the emotional side of body acne. The right routine can make a real difference. Clear skin usually requires continued care, and I still treat my own back today.
This blog is for informational purposes only and is not intended to diagnose or treat a medical condition.
