Back and Chest Acne: How to Use a Benzoyl Peroxide Wash
SkinArticleAbout 30% to 60% of people with acne on the face also get it on the back or chest. US dermatology guidance strongly recommends benzoyl peroxide, and for the back, dermatologists suggest leaving the wash on for two to five minutes before rinsing. Results take six to eight weeks to start showing. Here is how to use it, what to skip, and when back acne needs a dermatologist.
In this article
Spots on the back and chest are common in adults, and easy to ignore until a strappy top or a swimsuit comes out.
How common it is
Among people with acne on the face, about 30% to 60% also have it on the back or chest.1 Acne on the body without any on the face is much less common, under 1% to 14%.1 Women and men are affected about equally.1 (The review leaned on surveys of people aged 14 to 29, and one author worked for an acne-product company.1)
Benzoyl peroxide
US dermatology guidelines give benzoyl peroxide a strong recommendation for acne, alongside retinoids, topical antibiotics and the antibiotic doxycycline.2
How to use a wash on your back:3
- Leave it on 2 to 5 minutes. Back skin is thicker than face skin, and contact time helps.
- Start at 5.3% to limit dryness and peeling; 10% is the strongest over-the-counter strength.
- Rinse well, because it bleaches fabric. Use white towels and sheets.
In the shower, that can mean lathering your back and chest first, washing everything else while it sits, and rinsing it off last.
Adding adapalene, an over-the-counter retinoid gel, can improve results.3 Combining treatments that work in different ways is recommended.2
What to skip
- Loofahs, back brushes, scrubs and antibacterial soaps, which can make acne worse.3
- Backpack straps and anything that rubs the same patch all day.3
- Picking and popping.3
Give it time
Results usually start in 6 to 8 weeks, and full clearing can take 3 to 4 months.3
See a dermatologist for deep, painful acne on the back or anywhere else.3 Itchy, same-sized bumps that don’t respond to acne care may be a yeast problem instead; see fungal folliculitis. For adult acne generally, see why you’re breaking out as an adult.
Try: “I’ve used a benzoyl peroxide wash on my back for two months with only a little improvement. Would adding a retinoid help, or do I need a prescription?”
Skin, Head to Toe covers this in Chapter 6, “Bumps, Backs and Bottoms,” in a section called “Back and Chest.” Its Skin Sort separates ordinary spots worth a home trial from deep lumps and itchy look-alikes that need a clinician. See the book.
This article is for general educational purposes only and is not medical advice. It isn't a substitute for diagnosis or treatment from a qualified healthcare professional who knows your health history. Benzoyl peroxide bleaches fabric and can irritate skin; stop and seek advice if you get a rash, swelling or severe burning. Ask before using adapalene or other retinoids if you're pregnant or could be. See a dermatologist for deep, painful lumps, scarring, dark marks, or acne that hasn't improved after two to three months. Girl Playbook does not endorse any specific product, test, or provider.
Girl Playbook sells this book. It provides education and worksheets, not individualized medical care.
Sources
The research behind this article, in the order it’s cited. How we source our articles.
- Journal of Clinical and Aesthetic Dermatology (via PubMed Central), 2022Prevalence and Demographics of Truncal Involvement Among Acne Patients: Survey Data and a Review of the Literature (opens in a new tab)abcd
- Journal of the American Academy of Dermatology (abstract via PubMed), 2024Guidelines of care for the management of acne vulgaris (opens in a new tab)ab
- American Academy of Dermatology Association, 2023Back acne: How to get rid of it (opens in a new tab)abcdefg
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