The shaving alone tends to do wonders for some reason. I deal with skin issues with Holly a lot so I always have the sprays and solutions on hand. But if you could just keep it clean and then put hydrocortisone on it, it might do the trick. If she's licking or chewing at it too much, she may need the cone of despair again.
I have used Neosporin on rashes when the girls would get them. But just watch it to see if it gets worse. Molly had little bumps on her belly, but the were raised, not a flat rash, and it ended up to be a staph infection. The vet put he ron an antibiotic & it cleared up right away.
Can you get a picture of it?
Looks like a bruise but if it is open raw rash/hot spot you need to shave it and keep it dry. I think that is what the Gold Bond powder attempts to do. I would try neosporin or cortizone cream on it if it is a rash but if it is open and raw cortizone burns so go with the neosporin.
The yellow part in the middle is curious, makes me think bruise. If it is a staph infection, that is an easy cure too. Whatever you do, don't take her to that er vet again, LOL! No telling what he'd suggest
found this on bruising:
Go over the animals body slowly, moving fur aside every inch or so. Look for any changes in color. Specifically look for blue, brown or yellow areas.
Press on the spot with your hand. See if the animal pulls away in pain. This verifies that it's a bruised area.
Determine if the bruise is hard or raised. If so, it might not be a bruise but a cyst or tumor.
Look to see if the fur is thinning in that area. That would also indicate a bigger problem.
Figure out how old the bruise is. There are essentially two types--bruises that are new and bruises that are several weeks old. You can tell because older bruises are yellowed in color.
Treat the bruise by placing a cold compress on it. Hold it there for 10 minutes, if possible.