proactiv... any side effects???

he's taken every prescritption possible from the highest dosage of antibiotic to every topical cream avaialble since he was a teenager. now his acne isnt that bad. jus a few pop now n then n leave indentations of sorts. so was lokin to help him with that. he's been to wayy to many derms. n now has given up . so nothing helps the marks or indentations left behind by acne ???