Products such as cleansers, lotions and peels that contain lactic acid are applied topically to the skin, and they get right to work. These products improve skin's texture through exfoliation -- AHAs encourage the skin to slough off its old, dead skin cells revealing the glow of healthy skin cells hidden underneath. They help reduce the appearance of acne scars, age-related spots and pigmentation. They also help firm up sagging skin, fine lines and wrinkles by promoting collagen growth in the deeper layers of your skin.
Not all skin texture problems can be solved with an AHA product. If your skin develops thick patches or there are areas of swelling and lactic acid doesn't seem to be working, it's time to see a doctor. Some skin conditions are caused by rosacea, skin cancer and other underlying illnesses such as diabetes, a vitamin deficiency or a thyroid problem.