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.
) 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.