I’ll never forget the first time I saw it — a strange, almost neon-orange blotch glaring back at me from my favorite grey hand towel. It wasn’t a normal stain; it looked unnatural, like someone had swiped it with a fluorescent highlighter. I assumed it was rust from the towel bar or maybe a forgotten spill. I tossed it in the wash with extra detergent, sure it would vanish. It didn’t.

Over the next few weeks, more towels were “infected,” and my bathroom looked like it had survived an orange confetti explosion. If you’ve noticed stubborn orange marks on towels, pillowcases, or clothes, you’re not crazy — and it’s not always “just dirt.” The biggest offender? Benzoyl peroxide, a common acne-treatment ingredient. It doesn’t stain in the traditional sense — it actually bleaches the fabric dye, leaving permanent orange or yellow patches wherever your skin or hands touched.