It may take a combination of treatments to get rid of the brown spots on your body. Salicylic acids, hydroquinones and other mild exfoliators may be necessary. In addition chemical peels with trichloroacetic acid can help remove these marks more quickly. Any deeper scars may need lasers such as eMatrix. Ematrix laser is a "color-blind" laser that can help remove deeper scars, especially on the back and face. As with all cosmetic procedures please find a board certified dermatologist in your area that has a great deal of experience with lasers and acne for the best results.
Chemical peels can be very helpful in treating discoloration after
acne. Unfortunately it is not a quick fix. Doing salicylic and
glycolic peels in conjunction can improve and speed up results better than doing
the two different peels separately. Also using cleansers at home with
glycolic and salicylic acid can help.