Suggest Remedy For Darkening Of Facial Skin Post Acne Medication

Hello Doctor,im Archana (25 years old) from chennai,actually im suffering from acne for the past years.recently i have consulted dermatalogist and undergone treatment,but the acne didnt got cured,but my skin becomes so dark and dark.so i stopped the medicines..can u help me hw to get back my original skin tone atleast..give me a permanent solution for tis..im facing lot of problems due to this instability in my face(looking)..pls help me