To my untrained eye it almost looks like a fungal infection. I'd ask the vet if there is some sort of ointment that would be safe to put on her.
Other than that all i can think of is "sports tape." It's actually more like an ace bandage.
Good luck! I hope other PTer's have some great advice for you.
Let nature guide your actions and you will never have to worry if you did the right thing. ~ crow_noir
The pet world excels where the human world is lacking; sterilization and adoption. ~ crow_noir
Please, if your dog is arthritic look into getting it Elk Velvet Antler. Look up my posts on it, PM me, or look it up on a search engine; but please if you love your dog and want it to live many more years consider this option. I've seen so many posts on here about dogs needlessly suffering. I can't make a new post about EVA every time so this plea is going here. EVA also helps with other ailments such as anemia.