I just went to see the dermatologist on 12/27 due to small patches on my chest and was told it was a fungal infection. But, she said she's seen many perfectly healthy young people get this. When I told her I take immunosuppressants, she said it may have made me more likely to get it, but that many healthy people do as well. Mine started back in the summer when I was working out in the yard a lot (putting in a new flower bed) but was slowly spreading. She said the kind I have may come and go for a few years, but that it eventually goes away as your immune system changes (maybe as your body grows immune to it?). Said mine has no cure but sold me a cream to put on it, and it seems to be helping.