Thanks for the query.
Your description of rash
is matching to those seen in mild viral infections.
You can wait for the rash to decrease as it is not a severe condition.
Just apply some aloevera
If the rash spreads further or you get any other symptom,
You must meet a dermatologist
Let me know if you have any other doubt.
you can ask a direct question to me on this forum, following the below link.
Wishing you a good health.