Start by soothing your skin with Elevase Moisture Booster followed by daily Melarase AM and PM followed by Melapads to lighten the discoloration. Best, Dr. KaramanoukianLos Angeles
From the look of your photo it appears that dark patches are from the salicylic that was applied. Consult with your physician and make sure you wear sunscreen and follow up with the physician to make sure you do not hyperpigment.