Articles

Hair that falls flat or feels greasy a day after washing is often a scalp problem rather than a hair problem. Here is what a scalp scrub actually does, how scalp exfoliation works, how often to use one, and when your scalp is better left alone.

Glycolic acid is an AHA, salicylic acid is a BHA, and they are not interchangeable. One works on the skin's surface, the other inside the pore. Here is how to tell which exfoliant your skin actually needs — and how to use both without irritation.