The most common reason for strange orange or light-colored marks on towels is a chemical called benzoyl peroxide. It’s a popular acne-fighting ingredient found in many products such as PanOxyl, Clearasil, Neutrogena, and some prescription creams. While it works well on skin, it is also a strong oxidizing agent—meaning it can act a lot like bleach when it touches fabric.
On dark towels like black, navy, or charcoal, the bleaching process often turns the fabric orange, yellow, or even pink. That happens because the darker pigments in the dye are destroyed first, leaving behind lighter base tones. A simple way to tell the difference is this: if the mark is lighter than the towel, it’s likely bleaching. If it’s darker, it’s probably a regular stain.
