Amoxicillin an antibiotic in the Penicillin family. Amoxicillin is a very common antibiotic that is used to treat many different kinds of infection.
Amoxicillin is occasionally used to treat acne. Many acne patients have reported that Amoxicillin helped improve their acne symptoms. Antibiotic susceptibility testing indicates that the acne-causing P. acnes bacterium tends to be highly sensitive to antibiotics in the Penicillin family, including Amoxicillin.
Amoxicillin should not be used by people that are allergic to Penicillin family antibiotics (eg. Penicillin G, Ampicillin) due to an increased risk of side effects.