Alpha hydroxy acids (AHAs) are naturally occurring molecules found in fruit and milk. They are great for exfoliating since they loosen the dead skin cells to reveal softer skin.
The AHAs included in most beauty products include:
Salicylic acid (beta hydroxy acid)
Skincare products including AHAs can help with pigmentation, fine lines, age spots and pores. Because AHAs are such an active ingredient, you may find you get irritated skin or even sun sensitivity if you don't protect your skin with sunscreen. The sun senstivity doesn't just last the day you are using the product, but for up to a week.
Moisturisers that contain AHAs are great for reducing ingrown hairs. If the man in your life shaves, then make sure his moisturiser contains it to help with ingrown hairs.