You can't get HIV from touching a small wound with pus. You get HIV from unprotected vaginal or anal sex or sharing IV drug needles. Period. Pus on a wound means that white blood cells are at the site trying to kick an infection there. Really, none of that is relevant to HIV. Time to either relax or educate yourself on how HIV is transmitted or see a doctor for anxiety.
Is this the same oral sex encounter that you mentioned in your last thread a few days ago?