What kind of juvenile arthritis causes skin rash and fever?

Depends on which symptoms came first.

If the JRA came befor the rash and fever then you'd have to talk to an arthritis specialist.

If the rash and fever came before the JRA then it may be Lyme's Disease. Most people think that the rash has to be target shaped for lyme to be possible. In fact Lyme rash can com in the classic target, a ring, or just a consistent red rash. There can be a single lesion or multiple and up to 30% of people doen't even have a rash.