To answer your question about whether it
's caused by treatment, here's an archived thread wit
h a quote from jmjm, who researched skin problems a lot:
"Just to add a lit
tle, many of the skin disorders, especially immune-related condit
ions like psoriasis are caused/flared by the interferon not the ribavirin.
n't exist, but it does mean
not every rash is caused by the riba.