best wishes trying to find out what it is strangfrik. I thought I had Ringworm a while back. Eventually I saw a derm who diagnosed it as Eczema. Some of the patches appearance were very similar to Ringworm. If you think it is possibly fungal, tea tree oil, and neem oil are natural anti-fungals, and clotrimazole and lamisil etc over the counter drug brands.

Get checked with the doc, as if you catch it early is easier to treat I believe.. Don't know about Poison Ivy..

M.B.x