Thanks everyone - I'm sure it isn't ringworm. I had to deal with that after I brought Maggie home (she was a stray). I'm sure it's nothing serious, because they do fight & play pretty rough, but am going to check with the vet. Yes, they do all eat out of plastic food dishes, so I will switch (never thought about that). I use a plastic rubbermaid type container for their food and empty margarine / butter containers for water.