Thanks for writing to HCM.
As you were already having fever it seems that the rash you have developed can be due to fever due to some viral illness.Fever which is viral in origin, can be related with rashes all over the body.
Acne does not cause such acute eruption of generalized rash.
Possibilities that can be considered are rash with fever could be due to:
-other viral exanthems
Viral exanthems need supportive treatment with paracetamol
for fever and antihistaminics for itching and to decrease rash.It will subside gradually in 5-6 days.
Rash can also occur due to the drugs and antibiotic like amoxicillin
,sulfonamides, or other drugs like NSAIDs.
I would like suggest to take dermatologist
opinion for clinical correlation.
Hope this could help you better.