Logan, I hope the Vet finds nothing serious with Lilly. I know how worried you must be.
Perry had that kind of thing on his back legs, he was biting them all the time, so we took him to the Vet and he had scabs and lost a lot of his hair on his legs, the Vet gave us some type of cream to put on which cleared it up, I thought he said he was allergic to flea bites, although we didn't see any fleas on him. But it did clear up and the hair grew back. I can't imagine why Lilly gained so much weight, it could be a thyroid problem, I'm sure they have medicine for that. I'll be thinking about her until we hear good news that she will be o.k.
A big hug from Daisy and Perry and me for Lilly.

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