Hello,
Well, while it is possible it could be from an injury, I would have thought by now it should have reduced
down in size. You could try putting some raw honey on that area to see if that helps out any. If it doesn't
seem to bother her, & it doesn't get larger that is up to you as to whether or not to take her for a vet visit.
Since she is still eating without any trouble, you can try the honey for awhile. Let us know how that goes
& how she is doing.
Tracie