What is glycolic acid, and how does it relate to AHAs, and PHAs?
Glycolic acid is the leading member of the group of alphahydroxy acids (AHAs) and is very popular at the moment. It is useful for exfoliating and smoothing the skin and plays a role in treating fine wrinkles, acne, and other conditions. The only caveat is that it can be a little irritating if you have sensitive skin. PHAs, or polyhydroxy acids, (specifically gluconolactone) offer similar benefits and seem to be less irritating. I usually recommend that my patients with dry or sensitive skin begin with the lowest percentage of glycolic acid available. A slight tingling or a small amount of redness is not uncommon at first but it should disappear in a few weeks. If not, there are several options. One is to mix the glycolic acid cream 50/50 with your favorite moisturizer and use it only every other day (or even every 3rd day). Using this approach, nearly everyone should be able to enjoy the benefits these products. If you have sensitive skin, the best alternative to AHAs is probably Kiner
