Looks like a hot spot , if you have clippers shave the area around it to open it up, they happen when moisture gets trapped /
allergies and the dog licks it and makes it worse , go a bit father up than the area itself with the clippers ., usually there is more than the eye can see so once you remove the fur around any obviously irritated area just clip a bit more so you have clean “margins” . Looking at the picture I think it’s spread further than you can see and that is generally the case .I use witch hazel on any hot spots I clip , it really does a good job of drying it out. This was a recommendation of one of the vets I used to work with who hated wasting clients money on fancy creams or oral antibiotics. If you don’t want to do the witch hazel just clipping it so it gets air should do the trick , but clip it as soon as you can as these things can go from a dime size to engulfing a large area fast . Usually a cone isn’t necessary once it has room to air out , but if your dog continues to lick a cone will do the trick , or spray bitter apple around the adjacent fur , do not let it hit the hot spot as it may irritate it. Hope this helps. If you don’t have clippers I would suggest a cordless clipper as they are easier to handle and will cost you less than a vet visit. I have both corded and battery charged and I always go to the cordless . The brand of cordless I use is Oneisall you can get them on Amazon. Clipping it won’t hurt and ifits not getting better obviously go to the vet .
Noticed my boy chewing at/licking this spot on his foot for a couple days last week but didn't think much of it, but then I noticed it appeared to be red and looked raw or like it had been possibly bleeding. Feeling it, it feels like a bit raised like it's swollen or something. He's not acting any differently, but idk what this is. Any ideas?