Stop all inhale of medicines if not recommended by a doctor, try something natural.
Try to take some Anti-oxidants,preferably not via medicines u can use green tea and leafy vegetables,carrotss,almonds etc.
It can be due to hyperpigmentation or melasma skin. You can use cosmetic preparation that have demelanizing contents or seek a guidance of a dermatologist. Alternately, you have the option of cosmetic laser therapy to help you look better, though it may be a costlier.
It is very difficult to precisely confirm a diagnosis without examination and investigations and the answer is based on the medical information provided. For exact diagnosis, you are requested to consult your doctor. I sincerely hope that helps. Take care and please do keep me posted on how you are doing.