I do not think that Pityriasis Rosea affects your life span, unless you get suicidal about the rash! I certainly contemplated it several times. Since this is normally a disease that goes away by itself, there does not seem to be any research being done. I find that very sad, because if the researchers had it, they would certainly want it gone!
I would buy a jar of Prreze, send it to dermatologists, and tell them it works!