Mandelic, salicylic, and TCA (trichloroacetic acid) peels are a popular way to exfoliate facial skin and enhance its texture and tone. Mandelic and salicylic peels are gentler alternatives to TCA peels and are frequently used to treat acne. TCA peels, on the other hand, penetrate deeper into the skin and can address issues such as fine lines, wrinkles, and age spots.