I was recently involved in an assault. mostly have grazes and bruises but there is what looks like a bite mark on my shoulder. worried regarding tetanus or hiv

I am Sorry To Hear: about your assault. Have you seen a medical professional since the assault? If not, schedule an appointment right away, explain what happened and request a tetanus booster (DTAP) and testing for HIV, other STD's and any other possible infections the professional recommends. The HIV test should be repeated in about 3 months to be certain. While it is unlikely to get it this way it is possible.