Anyone who’s ever worn makeup has experienced the moment when you smooth foundation over your skin-care-prepped face and, just when you’re about to walk out the door, you notice a little crumb on your cheek, and then another, and another. Suddenly your whole face is peeling, and you feel like Miss Havisham. In the beauty world, this phenomenon is called “pilling”; in the regular world, it’s called “maddening.” Javon Ford, a cosmetic chemist, tells us what’s going on and how to prevent pilling from messing up your day.

Pilling happens when whatever you’re layering is incompatible.