I know this is a reach but when Guinness gets bug bites he bites at them and cause spots like that... Could it be a spot if she was itchy she could have for lack of better way of putting it bit if off herself it she was itchy?
__________________ Alisha mommy to Guinness Stout 7 & Stella Artois 5 & Teagan 4    Guinness & Stella proud Teapot Club Members |