I found a lump…
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My Kiya got a lump exactly like you descibed. It was on her back thigh and never went away on it's own. I took her to the vet and they verified it was just a cyst and drained it. They said not to worry if it comes back, because it likely will. It would take surgery to remove permanently, but the vet said it's not worth it unless Kiya was going to be under anesthesia for another reason.