I have been visiting hamster forums lately in order to try to educate people what ringworm looks like on a hamster (at least from my experience, and it DOES NOT manifest itself in a “ring“). I have pictures of the before and after (I was able to treat them successfully). If you have any questions regarding testing/treatment, please do not hesitate to ask. The first tests we ran for ringworm were a false negative, so be careful!!
http://sites.google.com/site/ourrobohamsters/