wow. WERIDEST thing.. Layla had that too! one day I just NOTICED it and thus had NO idea where it came from. For about 2-3 months i'd say it scabbed and then healed and scabbed and then healed. I brought her to the vet who thought it was from her hair clip which made me fee AWFUL! Her hair has never grown back there... but that little bald spot is how i know she is mine