Skin care dermatologist, alpha hydroxy acids are gentle exfoliants used to reduce the appearance of fine lines and wrinkles. They boost collagen production, unclog pores, and even out skin tone. Dermatologists recommend alpha hydroxy acids for skin care because they are appropriate for most skin types. Several types of alpha hydroxy acids are available, including glycolic acid, lactic acid, citric acid, and malic acid. These acids are known to have numerous benefits, and they are safe to use on most skin types.