vet thinks bee stings, she must have gotten into a nest or hive. She is better after a few injections and they sent her home with Prednisone. Benadryl didn't do a thing for it.
WOW, those look like they would be severely uncomfortable for your dog. Have you changed her food lately, or added any medication for her? I'm thinking she might be allergic to something. Please take her to the vet for a full evaluation. Blessings to you and your dog - Blu