I believe the acute rash of HIV is widespread, not just on the wrist, and is associated with fever, malaise, and other internal symptoms. Your description does not match chickenpox at all. You can't get chickenpox twice (or at least that would be extremely rare.) The acne on your back and pimple on the chest should be looked at by a doctor for proper advice. You might want to be tested for HIV in a few weeks and again in a few months, just for reassurance that your high-risk behavior hasn't left you with anything, and you might want to avoid high risk behavior too....
Best.
Dr. Rockoff
Thanks