How can i tell the difference between acne and hiv rash?

Whoa: This is serious. The rash of acute HIV infection is unlikely to feature pustules / pimples or blackheads. But this is beside the point. If you are concerned that you are hiv-positive, you won't rest or be able to focus on the other tasks of life until you get a reliable test -- if a recent exposure, a pcr. It may not be inexpensive, but it's well worth it. Get with your physician now.