Suggest Treatment For Pigmentation Near Chin

Hi , I am having pigmentaion near my chin area ..it look very bad..had gone for homepathy treatment for 1 yr but nothing wrk..my rest of body parts are very fair comapre to my face.i am really disturb and tensed due to that ..dont want to simply go again under such useless treatment.Can any one suggest whom to consult nad wat to do?