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How old is this dog? Does the dog scratch?
It sounds like bacterial/allergy components. I dont think it has anything to do with the injury. This breed has a terrible time with skin diseases...thyroid is another thing that would need to be checked. Benadryl can help...on 25mg twice daily and any topical relief for itching. A good shampoo for mixed infection of fungal and bacteria is Selsun Blue.
Also start OmegaFatty Acids (fishoils) and Vitamin E on your dog...at Petsmart or other pet stores they have this vitamin mix for the skin...as long as the omegafatty acids are there...this should help the overall health.
Hopefully these things can help...until a vet is possible.
My prayers are with your family and dog.