Hi, acne treatment depends upon its severity whether it is mild, moderate or severe in nature. In other words, it has to be seen what kind of lesions one is having predominantly that is whether you are having more of comedones or papules or pustules or severe nodules cysts and abscesses. The treatment plan changes accordingly. The chances of scarring and pigmentation are more with pustular nodular acne or with cysts and abscesses. In your case, you can continue with tab azithromycin as prescribed, along with topical application of benzoyl peroxide 2.5% in morning and adapalene gel in night. Use a salicylic acid based face cleanser. Follow this schedule for 3 weeks, if you dont have much of response, then one can think of adding isotretinoin or doing chemical peels(glycolic acid or salicylic peels). For the same, you need to consult a dermatologist. Take care.