Hello i use ULTRA VIOLET SPRAY from harbro about £3 a tin it's a foot & sanitising spray & i use on all my dog's that get cut & i have found it help's grow hair back but the spray is purple if it was clear i would spray it on my head to try hair regrowth & see if if it realy work's.This cut be cheap for you to try & if it dosent then use it on cut's & bite's.