Parvo b19 virus
causes upper respiratory symtpoms and low grade fever
which resolve promptly, to be followed by a facial rash
with a "slapped cheek" appearance.
The remainder of the body soon develops rashes, sparing the palms and soles. The rash will soon show central clearing, which has a "lacy, fishnet" appearance. The illness is mild and self-limited, and the rash waxes & wanes. No treatment.