maybe ask your vet about ring worm , here is a link that has photos so you can see what it looks like

Ringworm in Dogs - Pictures of Ringworm -Symptoms and Treatment

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thanks, sugarbaby. I never thought of that. Although I don't think that's the problem. I think it's a food alergy. Chico's skin looks a little better since I changed him to Blue Buffalo. I'm going to get his skin checked on Thursday at the vet, when he goes for his shot.