Thank you, guys. Members on another forum also immediately suggested histiocytoma as well. I checked the growth today, and maybe I'm being naive, but it doesn't look nearly as rounded or 'swollen' as it did the days before. It sort of looks like it's shrinking around the edges, so we'll be giving it time to heal on its own. As soon as I see any growth, though, I'll be whisking her off to the vet.

Can you tell how RELIEVED I am??