"i&#039;m 24 and have mild to moderate acne on my chin and red hyperpigmentation spots from old pimples. i&#039;ve tried benzoyl peroxide and salicyicate acid, but this is more effective and also helps with hyperpigmentation from old acne. i also prefer not to take a pill (antibiotics, accutane) to treat acne. i was excited to find this over the counter. the first 3 days i used it, my acne got worse. within a week, however, my pimples dried up. it is very effective. i gave 9/10 and not 10/10 because my face has been very dry, and sometimes it burns a little. this is a normal side effect i expect to get better with using it more. you can use this every other night if your skin gets too dry."