hello and welcome to hcm forum Kiran, first of all, i would like to inform you that using cosmetic products is never a good option, but as you mentioned you met a dermatologist, i assume you must have got hormonal tests done before starting with the treatment with your doctor. oral antibiotics(azithromycin) is usually indicated for 12 weeks along with topical ointments for acne, but that can only be done by your dermatologist. you can use kojic acid gel(2%) for pigmentation , apply it all over the face(twice/day), always wear a sunscreen gel(no cream/lotion), drink 8-10 glasses of water, consume oral antioxidants(once/daily) for 4 weeks, besides, there are other options like fractional laser, IPL, and even chemical peels to get rid of acne and pigmentation problem. kindly visit and discuss these options with your concerned doctor, i hope i answered your query, i wish you good health.