It is not possible for an ARS rash
to come and go
. The rash
lasts no longer than the ARS syndrome itself, i.e. 2-4 weeks, then is gonen. Also, rash is never the only symptom of ARS. There always are other things, especially fever and usually fatigue, swollen lymph nodes in multiple areas of the body, and often sore throat.
2) The ARS rash can occur anywhere on the body, but usually is widespread. It certainly could occur in the areas you mention.