Does the skin rash associated with fifth disease pain?

Sometimes itches. Most of my kids have no mention of pain with this illness but occasionally state that the lacy rash they get over their arms/legs/trunk is a bit itchy.
No. It may itch a bit, but it doesn't hurt. So if the rash is painful, it is something else, in all probability. And for the record (this is one of my major pet peeves), a rash can only occur on the skin, so "skin rash" is redundant; there's no such thing as a "hair rash", "liver rash", "kidney rash", etc., etc.
Heat. It is called slapped cheeks so there may be heat. Pain is not normally noted. Resolve within a few days without any treatment.