i got a rash in spots all over my arms. it turned into like blister like pimples it is going away now. herpes?

it iched really bad. but is going away now i have the same thing in one spot on the back of my thy below my butt cheek it is an area that is 4 inches around and itches really bad. i have had that for 4 days now. is this caracteristics of herpes?
i have just started a new anti biotic for my tooth also so alergic reaction maby.

could possibly be a allergy?
or hives , anything really , check with your dr , and they will prolly send you too see a dermatoligist ,
i have never heard of herpes being anywhere else then mouth and genitals , but im no dr