Strange orange or light-colored marks on towels are most commonly caused by benzoyl peroxide. This acne-fighting ingredient is found in products like PanOxyl, Clearasil, and Neutrogena, as well as prescription creams. While effective on skin, it can damage fabric.

Benzoyl peroxide is a strong oxidizing agent, meaning it works similarly to bleach when it comes into contact with textiles. Instead of cleaning the fabric, it strips away dye.

On dark towels—such as black, navy, or charcoal—the damaged areas often appear orange, yellow, or pink. This happens because darker pigments break down first, revealing lighter base tones underneath