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Hello. Thanks for the question.
The first thing to rule out here is a flea allergy dermatitis. If there are any fleas or flea dirt on the dog, then that could be the issue. This time of year, I recommend monthly flea preventative on all pets.
This may also be a skin infection, especially with the raw look to the lesions. In that case, it's usually allergies with a secondary staph infection. I'll usually treat them with a round of antibiotics (Cephalexin) + a short course of a steroid (Prednisone). I'll also have the owners pick up Benadryl to give at home as needed. The dose of Benadryl in dogs is 1-2 mg per lb body weight. It can be given up to every 6-8 hours.
I hope this helps, let me know if you have any other questions.