I have a mark on my arm. I thought it was ring worm because I have another ringworm on my opposite arm. I work with kids and I had a child in my class with ring worm. However, this mark is a little different. It has a clearly defined red circle but it is a little painful. Also on the outside of the circle there is red irritation on my skin. I have been treating with Lotrimin. The other mark responded well, this mark just seems to not be getting better, yet it s not getting worse.