I am 32 years old I have tiny small pimples on forehead and acne scars on cheeks I used 30% aha and 2%bha exfoliating solution every week now, I have started to use tretinoin. I need to ask whether, I should exfoliate (mon) and use tretinoin (sat) once a week or shall I use only tretinoin? Also can I use vitamin c serum or should wait for skin to become the way I want and use vitamin c afterwards.