Has anyone seen these type of sores before?? The one with the black is on my guys leg and appeared a day ago..just tonight the other one popped up between his toes??? My question is could this be part of an allergy? I just got to thinking and as ive asked before im working on switching up his foods...the brand hes on (yes its crap) has only had chicken in stock when ive bought it. Theses have only appeared since then. Also we r fighting fleas hes on advantix weve treated our yard ive been using vinegar on his coat and DE could it be a flea bite reaction!! Ive got a appointment booked for the vet but they cant get us till fri so just wondering before then..thanx! Hopefully the pics load!