Have you ever noticed strange orange, yellow, or pink patches appearing on a dark towel even though it has been washed regularly? One possible explanation is benzoyl peroxide, an ingredient commonly found in acne treatments. The chemical can act as a bleaching agent on dyed fabrics, gradually removing color when it comes into contact with towels, washcloths, pillowcases, or clothing.

Unlike a typical stain, benzoyl peroxide does not simply leave something on the surface of the fabric. It can chemically alter or oxidize the dyes, causing the original color to fade or disappear in the affected areas. That is why these marks may remain after repeated washing and can sometimes look like rust, cleaning-product residue, or unexplained discoloration.

Once the dye has been chemically damaged, ordinary laundry products generally cannot restore the original color. Detergents, stain removers, and washing at higher temperatures may clean the fabric, but they cannot replace dye that has already been altered. In other words, the pale patches are usually not stains that can simply be washed away.

One simple way to reduce the problem is to use white towels and washcloths when applying benzoyl peroxide products. Although the chemical can still affect fabric, the change is much less noticeable on white material. Rinsing your face and hands thoroughly after using an acne treatment can also help reduce the amount of product transferred to towels and other fabrics.

If your favorite dark towel has already developed these mysterious patches, there may be little you can do to restore its original appearance. But that does not necessarily mean it belongs in the trash. Consider repurposing it as a cleaning cloth or household rag. The color may be damaged, but the towel can still have plenty of useful life left.