The sun feels weaker in September, but the UV index is still high enough to tan — and high enough to burn. Here's how late-season tanning actually works and how to time it right.

Those little lamps at the nail salon emit UVA — the same wavelength that ages skin. Here's what the research actually says, and the 30-second habit dermatologists recommend before every gel manicure.

Everyone else looks normal and you look like a ghost. Sunscreen flashback is caused by specific UV filters bouncing light back at the camera — here's which ones, and how to avoid it without giving up SPF.

SPF, broad spectrum, 80 minutes, PA+++, a wall of chemical names — here's how to decode any sunscreen bottle in about thirty seconds and know exactly what you're buying.

Morning SPF stops working around lunchtime — but nobody wants to wash off a full face to fix it. Here are four ways to reapply sunscreen over makeup, ranked by how well they actually protect you.