welcome to health care magic.Thanks for writing here.
Rash developing after sore throat
and ear ache
suggest some viral cause.
Based on your description it is most probably pitryasis rosecea.It is usually self limiting and will subside with time.
You can take antihistaminics like cetrizine
for reliving itch and apply a mild steroidal lotion like desonide
lotion two to three times daily.
I hope this can solve your query.Take care.