Suggest Treatment For Itchy, Bumpy Rashes That Have Spread Across My Body?

I have itchy, bumpy rashes that have spread across my body over night. It started in a patch on my left foot and then traveled to my knee, up my thigh, to my armpit and then back down the right side of my body in the same locations. I just returned from India a couple weeks ago and as soon as I got back in country, I got super sick. Fever, sinus congestion, and sinus headaches, sore throat, the works. It lasted abt a week. I'm better nOw until this rash popped up! It's red and bumpy and crazy itchy! I don't know what to do with it other than anti itch lotions and Benadryl