Salicylic isn't used on everyone, have a skin analysis done first..and since u say that ure derm put u on anti-bio's means that u still have active acne. Give the anti-bio time to "kick-in" and in the mean time after u're skin analysis if he/she recommends the peel go for it.
Retin A really dried out u're skin and so does Skinoren, Benzomic. Maheen a salicylic peel works on just the acne and not the scarring, so I'd wait for the anti-bio's to work and for the acne to settle down then chose from various peels to get rid of the marks.
A salicylic peel usually begins with cleansing u're skin after that they apply vaseline to the delicate area's such as u're eyes, nose and lips and then spread the peel all over and re-apply it to "problem areas" U're derm shud be supervising the treatment and he/she wud tell the practitioner to neutralize the peel once he/she feels.
The after-care is just keeping out of the sun and wearin sunscreen at all times.