Sophie had got bit by a tick when she was about 8 months old.  And it did leave a hard bump in the location of the tick once it was removed.  It stayed for awhile, too.  I can't recall how long, but I remember thinking long enough that I was going to call the Vet if it wasn't gone in "x" number of days.     
				__________________  Sherry, Sophie, Ivan, Alfie, Addie, and Winston         |