Does benzoyl peroxide bleach skin, hair or towels?

Benzoyl peroxide bleaches hair and colored fabric. Every store label in the U.S. must say so, and the prescription gels carry the same warning. Skin is a different matter: the American Academy of Dermatology (AAD) calls the worry that benzoyl peroxide causes light spots on the skin "a myth." This guide covers what benzoyl peroxide bleaches, why, and how to keep your towels, pillowcases, clothes and hair safe while you use it. For the ingredient as a whole, see the benzoyl peroxide guide.

Skinli gives general education. A doctor or pharmacist is the right person to diagnose and treat your skin.

What the labels say

The FDA rule for store acne products, 21 CFR Part 333, requires this warning on every benzoyl peroxide product: "avoid contact with hair and dyed fabrics, which may be bleached by this product." You will find it under "When using this product" in the Drug Facts box, on washes, gels, creams and lotions alike.

The other health sources Skinli read say the same thing in their own words:

Source	What it says
FDA rule for store acne products	Hair and dyed fabrics "may be bleached by this product"
Prescription clindamycin and benzoyl peroxide gels	The gel "may bleach hair or colored fabric"
NHS	Do not get it "onto clothing, other fabrics or hair," because "it may bleach them"
MedlinePlus	Keep it "away from your hair and colored fabrics because it may bleach them"
NICE, England	It can cause "bleaching of hair and fabrics"
AAD	"It will bleach clothing, sheets, pillow cases, and towels"

The warning is about hair and fabric. None of these sources lists lighter skin as a side effect.

Does it bleach or lighten skin?

The AAD answers this directly on its page about acne in skin of color: "If you're worried about it causing light spots on your skin, don't be. That's a myth. It won't." The AAD also recommends benzoyl peroxide with a retinoid for mild acne in skin of color, saying the pair "works well in skin of color."

The skin changes benzoyl peroxide can cause are listed on the label: "redness, burning, itching, peeling, or possibly swelling." The label says irritation "may be reduced by using the product less frequently or in a lower concentration."

Benzoyl peroxide also does not fade dark marks left by acne. The AAD's advice for dark spots in skin of color is to "treat both the acne and the dark spots," because clearing acne removes "what's causing the dark spots." Other ingredients, such as retinoids and azelaic acid, work on the marks themselves.

The same AAD page says that starting treatment early matters most for darker skin. "Studies show that treating acne when it's just beginning can prevent acne from getting worse," it says, and if acne becomes moderate to severe before treatment begins, people with skin of color have a higher risk of "spots and patches of darker skin" and of keloids, a type of raised scar. Worry about bleaching is a poor reason to delay a treatment the AAD recommends for skin of color. The acne scars guide explains what benzoyl peroxide can and cannot do for marks and scars.

If you notice new white or pale patches that do not go away, see a doctor. Several skin conditions cause pale patches, and a doctor can tell them apart.

Why it bleaches fabric and hair

The prescription labels describe benzoyl peroxide as "an oxidizing agent with bactericidal and keratolytic effects." In plain words, it is a reactive chemical that kills bacteria and loosens dead skin cells. The labels do not explain the bleaching in more detail. Their warning names the two things that carry color: dyed fabric and hair.

Bleaching happens where the product touches: a pillowcase where your face rested, a towel where you patted your face dry, or a collar at your neckline. The warning names dyed fabric. White fabric has no dye to lose, which is why Skinli's plan uses a white towel and a white pillowcase.

Hair, eyebrows and beards

The label warning covers all hair, including the fine hair on your face. Three places need extra care:

• The hairline. Acne on the forehead sits right beside it. Stop the gel short of the hairline, and keep a hairband on while it dries.
• Eyebrows. They are close to the forehead and to the eyes, and the label already says to keep the product away from the eyes.
• Beards and mustaches. Acne under facial hair is hard to reach without touching the hair. A rinse-off wash leaves less product on the hair than a gel left on overnight.

The NHS says to wash your hands after every use. Gel left on your fingers can move to your hair when you push it back, and from there to a pillowcase.

Washes bleach less than leave-on gels

A wash is rinsed off after a minute or two, so less product stays on the skin to rub onto fabric. The AAD gives this as a reason to use a benzoyl peroxide wash on the back: "Rinsing it off prevents bleached clothes, sheets, and towels." A 2012 paper in the Journal of Drugs in Dermatology says cleansers are commonly used on the body partly "to avoid bleaching of fabric."

Rinsing only helps if it is thorough. Foam that runs down your neck, splashes onto a colored bath mat or is patted off with a colored towel can still leave marks. The face wash guide covers how long to leave a wash on before you rinse.

How to protect towels, sheets and clothes

These steps come from the labels, the AAD and Skinli's own plan:

1. Switch to white. Skinli's 12-week plan tells anyone starting benzoyl peroxide 2.5% gel to "buy a white towel and pillowcase," because the gel bleaches color. The AAD lists clothing, sheets, pillowcases and towels as the things at risk.
2. Use a thin layer. The FDA label directs "a thin layer." Skinli's plan uses one pea-sized amount spread over the whole area that gets pimples. Extra gel does not work better and has more to rub off.
3. Let it dry. Skinli's plan applies the gel to a fully dry face at night and waits 5 minutes before the next product. Give it time to dry before your face meets a pillow.
4. Wash your hands after applying it, as the NHS advises.
5. Mind your neckline. Put on sleepwear before you apply the gel, so you do not pull a colored shirt over a treated face.
6. For the chest or back, wear an old white T-shirt to bed, or use a rinse-off wash on those areas.
7. Keep the tube away from fabric on a bathroom counter, where it can drip onto a hand towel or bath mat.

Prescription gels bleach too

Prescription gels that combine benzoyl peroxide with an antibiotic or a retinoid carry the same warning. The label for clindamycin and benzoyl peroxide gel 1.2%/5% says it "may bleach hair or colored fabric," and the patient leaflet for a 1.2%/2.5% gel says to avoid getting it "in your hair or on colored fabric." The benzoyl peroxide part is the cause. The clindamycin and benzoyl peroxide guide covers those gels. For adapalene with benzoyl peroxide, see a retinoid with benzoyl peroxide.

Does strength change the bleaching?

The label warning is the same for every strength from 2.5% to 10%. Skinli found no study that compared how much different strengths bleach fabric. Lower strength, less product and shorter contact all mean less benzoyl peroxide available to reach fabric, but the safest approach at any strength is to keep it off fabric altogether. The strengths guide explains why 2.5% is a good starting point for other reasons: it cleared red pimples as well as 10% in trials, with less irritation.

Sun and bleaching are separate warnings

The label also says to "avoid unnecessary sun exposure and use a sunscreen." That warning is about the skin becoming more sensitive to sunlight, which the NHS confirms: "benzoyl peroxide makes skin more sensitive to sunlight." It is unrelated to bleaching. Use a broad-spectrum sunscreen in the daytime while you use benzoyl peroxide at night. The safety guide covers this and the other warnings.

When to see a doctor

See a doctor if you notice pale or white patches on your skin that last, if irritation is severe, or if your acne has not improved after 12 weeks of steady use. Stop using the product and get emergency help if you have signs of a serious allergic reaction, such as throat tightness, trouble breathing, feeling faint, or swelling of the eyes, face, lips or tongue. For a plan built from a photo of your skin, try the free Skinli acne plan. Skinli gives general education. A doctor is the right person to diagnose and treat your skin.