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It sounds like the dog might have a secondary bacterial or fungal infection. This is usually secondary to allergies and itching. This means that the secondary problem is caused by the primary.
When dogs scratch, they abrade the skin and allow bacterial and funguses to enter the skin. The result is a bacterial or fungal infection.
You need to see the vet so that they can get a culture and tell you what kind of treatment is necessary.
While you are there, you should also speak with the vet about a supplement that has omega three fatty acids. Good skin starts from the inside out and this can be very beneficial.
Let me know if you still have specific questions about this.
This is pretty common.
I would talk with the vet about a different low allergy diet, one that will have the least reaction.
I would also start the supplement.
You should also get her on a flea preventative if she is not already. Even if you don't see fleas, it only takes one to get the cycle started.
I would also use the prescribed dose of benadryl, especially during allergy season.
Keep in mind that dogs can have allergies to pollen, dust and other household allergens so you should evaluate your home and try to make it as allergy free as you possibly can for her.
Do you still have more questions about this?