What Can Be Done To Avoid Itching In Head After A Surgery For Bulge In Head?

hi doctor,my fiance was a professional cricketer.he got it by cricket ball in his head and the entire skin was chopped off. he got paralysed and was in coma for several months.this happend when he was 21 and nw he is 29 year old.lasr ear he under went a surgery where the ball hit as he was getting bludge in head due to blood clot.there he dont hav the hair as well. no skin from other part of body was used in his first sugery. i would like to knw if there will be any blood clott issue will hapenn again also any treatment for getting hairs on that place .he always getting ittiching in that place and if he scratch blood come as the skin is very delicate. is there any thing to be done to avoid scratch and always use cap.