It seems that you may be having viral exanthem
The erythematous rash
may follow viral infection of throat.
Symptomatic treatment may be taken.
If there is itching,take antihistaminics like levocetirizine
Antibiotics may be taken to prevent secondary bacterial infection.
lotion to soothe the skin.
Avoid soap bath ,which may irritate skin.
Improve immunity to prevent relapse of flu.
I hope you got my answer.
Dr. Ilyas Patel MD