Should i let my dog lick her wound?

so my dog gabby was at my dads friends house and his dog sludge doesnt like my dog very much and sludge was just bareing his teeth at her and then they got into a small fight but we broke it up quickly then gabby started limping so i checked her and i didnt see anything and she starting to walk on it fine again but then when i got home i noticed her licking her leg so i checked her and she has a gash on her leg. its not bleeding but shes consistanly licking it so i was wondering if i should let her keep licking it or bandage it?