DogFresh Oatmeal & Baking Soda Spray | Waterless Dog Shampoo and Conditioner | Natural Dog Deodorizing Spray | Itch Relief for Dogs | Dog Leave in Conditioner for Dry Itchy Skin | Puppy Safe (17oz)

Idk but from the pic, it looks like a hot spot. My dog had those. I know internally, its caused by their diet like high carb or allergies. I too was broke but had i had money, i would have gotten a blood thest to see what his values were. The only thing I did that worked was gently washed and spray "Peachy dog" spray on it or apply cortisone cream. Can you tell if itchy?? Here is the amazon link for that spray. Though its unavailable ATM, maybe you can get off website or something https://a.co/d/0gPZPi6P