Sores on paws

My dog has had sores in-between all her toes on all four paws for almost a month. Our vet gave her antibiotics and  the the sores receded a bit but didn't completely go away. Now they are coming back. She won't stop liking her paws any time we take the e-collar off. So we have left it on for over 2 weeks. I have looked up treatment for 'hot spots' but all the cures say to allow the effected area to breath. Since the problem is between toes the area isn't getting much air. Any help would be greatly appreciated.

[Aleda M Cheng, D.V.M., C.V.A]

Your vet should do a skin scraping,  or biopsy, and culture and sensitivity on the lesions, so the proper medication can be instituted.  She really needs some relief from the itching.  If your dog has not been placed on steroids and anti-histamines yet, she really needs to be for the time being until the results of the tests are returned.  

Causes for these types of lesions are:  allergies, fungal or bacterial infections, insect bites, poison ivy (contact dermatitis), auto-immune diseases, nutritional deficiencies(uncommon), and others.