indented. that's something that's going to raise concern a little bit when talking to dermatologists. squamous cell carcinoma. it tends to be a little rougher, patchier, scalier. that's what that looks like. a squamous cell carcinoma. rarely is it going to be something fatal. it's part of the reason people haven't paid as much attention to it. left untreated it can grow for sure. quickly, john, to your point. a, b, c, d. asymmetry, borders, color, diameter. look for those things. if those things are changing, that raises your level of concern, john. make a trip to the dermatologist. get it checked out. it's a lifeline disease. >> treatment options? >> you know, it's interesting. if you go, depend on the size and how long it's been there, dermatologists will sometimes freeze these off. sometimes they'll cut them off using a knife and send that off to the labor to for pathology to look and see what it is. sometimes if they aren't as concerned they'll use a topical