Suggest Treatment For Skin Darkening

hello doctor my self vikas patil. i m live in bharuch since last 25 years. and i m doing job as a medical representative since last 2 years. my age is 27 years. here in bharuch my skin treatment done by dr.bhavin surti and dr.rajat bhatia. i m suffer from like black mask. my face is lightly black now. i want brightness on my face and remove black mask.