My answer to your query is :
1.By any of oral medication it is not possible to get rid of these post acne scar marks or pigmentation which is already done.
2.However in Homeopathy we have medicines which can prevent acne formation and its secondary infection leading to pus formation and scars marks but for which complete case taking,symptom analysis is required for which take a consultation from a nearest Homeopath.
Next Steps
Take a consultation with a nearest Homeopath
Health Tips
wash you face with water as much as possible do not use any topical steroid creams