Hi, I am Dr. Peter and would like to help.
1- How long has this been going on?
2- Is he itchy?
1- How often do you bath him?
2- What do you use to bath him?
I use oatmeal shampoo that I buy from our vet. I bath him about every two to 3 weeks..he is inside dog and goes out to play n lay on the ground
The areas on his back and chest are red and inflammed and the ones on his tummy are red like aint bites.
That is a good shampoo and reasonable amount of time for a bath. The lesion you describe above are consistent with a bacterial infection (superficial pyoderma). These infections do not go away normally with antibacterial baths alone. They need to be treated with oral antibiotics for at least 2-3 weeks. Or, there is the potential for spreading deeper into the tissue and becoming more complicated. I would recommend you have your vet take a look and start him on oral antibiotics. In the meantime, pick up a shampoo called Chlorhexiderm and bath him 2-3 times a week for 2 weeks with chlorhexiderm shampoo.
If you have additional questions I will be glad to answer them.