But the experts note that it’s not just about what you put on your skin; it’s also about how and when you take it all off once the party is over. “If you plan to use [glow-in-the-dark makeup products], do your best to wash off the makeup as soon as possible,” says Dr. Zeichner. The FDA suggests that you check the labels on any novelty makeup (glow-in-the-dark or not) for removal instructions, and to be extra careful around your eyes, to ensure you don’t irritate your skin or cause a reaction.