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External treatment for your acne
has been failed right ? so now i would opine not to try anymore these sort of drugs. i think you must would have taken antibiotics, if not then you can take it from a good skin specialist as its cystic type of acne. 2nd thing can be tried is Homeopathic
drugs. you have chronic pits also, though it may or may not be completely removed but at least new formation can be stopped(by controlling the body's tendency of acne) with hy treatment. i m sure you will get some favorable result if u proceed.
I hope I answered your query. Wish you good health.