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Updated on September 23rd, 2025
Pet's info: Dog | American Staffordshire Terrier | Male | 9 years and 3 months old | 178 lbs
Hi I’m curious what these red bumps are or what they could be from? I noticed them again after I gave him a bath with very mild and natural shampoo. I also changed his food a few months ago and have seen these bumps for a long time but they recently broke out again. Majority of them are on his back closer to his hind legs and tail. If I scratch him or brush him he really enjoys it but they get red and irritated if I do.
2 Answers

Answered By Dr. Elizabeth
Veterinarian
Published on October 29th, 2019
Answered By Lauren Jones VMD
Veterinarian
Published on March 26th, 2017
It sounds as though you're doing everything you can for your pup! Since your vet could not find signs of fleas and your dog is receiving Advantage one a month, it is unlikely that fleas are involved in your dog's skin condition. Allergies to food or environmental conditions seem more likely in this case. That said, some dogs are highly allergic to fleas and one bite can make them really itchy.
Since you are describing lesions on his back with pus, I'm wondering if your dog has a skin infection as a result of itching. If your vet started him on antibiotics, some dogs can experience mild GI upset as a result of medications. Try offering a bland diet of boiled white meat chicken and white rice for a few days to see if that helps. If he continues to vomit by tomorrow, call your vet.
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