Thanks for the query.
You might have developed cellulitis
It is deep bacterial infection.
Treatment is with antibiotics but the choice of antibiotics should be based on culture and sensitivity tests.
I would like to know is there only a rash
or pus formation is also there.
If there is pus culture and sensitivity can be done.
Please meet a dermatologist
for exact diagnosis.
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.