Oh wow. I am glad to know that so I don't panic. After I read Brians post I ran in the bathroom and scraped to see if it came off. Man that was a relief to see it was still there and nothing under my nails. Whew. Close call.

How many different side affects does radiation have? I mean it seems like new ones every week. Some hang around for weeks and some only last a day or two. I hate surprises.