acne is indeed a bothersome but controllable affair. Most of the time it is about proper skin care and control until the sebaceous gland activity settles but this can take several years.
Control of recalcitrant acne typically requires continued use of the topical creams that you have mentioned above - Benzyl peroxids, BHA /AHA toners, Differin, antibiotic gels etc - and intermittent maintenance procedures such as chemical peels and lasers to help with the acne and PIH.
The more definitive solution would be the use of oral isotretinoin, but we try to reserve that for last due to its potential list of side effects.
Do not hesitate to arrange for a proper consultation to explore possible options; the earlier the acne is controlled, the less the scarring that themselves require treatment later.
Cheers,
Dr Shane Tan