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.

The neck and chest often age faster than the face because they get skincare last and sun first. Here's how to prevent decolletage wrinkles and sun spots.

Retinol and SPF are a power duo—but only if you use them correctly. Learn why sunscreen is essential with retinol, the right order to layer them, and how to avoid irritation.

Yes — UVA rays pass through glass and clouds. Here's when you really need sunscreen indoors and on overcast days, and when you can skip it.