Skin condition....... HELP PLEASE

yep could be an allergic reaction to something . i'm having a senior moment right now but was gonna suggest matbe a fungal or bacterial infection . all dogs have it but it is usally kept in check by the dogs own system , but occasionally it will flare up and get out of control and make them loose hair . damn it's hell getting old lol . well i'll be back when it pops into my head , maybe someone else can tell you what i'm getting a headache trying to remember . but a vet will do a scrape and tell you for sure , be sure and tell them all that you did as well .