Welcome to JustAnswer! I am a licensed veterinarian and would be glad to help!
1) Is the area spreading?
2) Is he on any medication such as flea / tick prevention?
3) Has your vet evaluated the area?
Yes, I was having problems.
1)Yes, the redness seems to be spreading from when I first noticed it. The red spots are new too.
2) We had a flea collar on him about 2 months ago because we noticed his scratching and thought he may have fleas. He doesn't presently have a flea collar on now.
3) No we have not seen a vet about this.