Sir, I Suffered From A Horrible Katori Wax 13 Days

sir, I suffered from a horrible katori wax 13 days earlier at that time my upper skin got burnt and skin got red in color and now my upperlip is black in color because and its looking like muchache i'm very tensed the wound has been healed but mark is still there please tell my whether Betnovate-N will going to work on my skin? and how much time will it take?