I woke up yesterday morning to a bite on my bum cheek. thinking it was a mosquito i didnt think to much until later in the afternoon. the bite it quite large and red. its abit swollen and there are tiny little blister like bumps. ?

Possible hsv: Herpes simplex quite often begins like this when located on the buttocks. Suggest that you visit a dermatologist to confirm and receive tx with an oral antiviral, such as valcyclovir. Occasionally herpes zoster can also start this way, but usually people in your age group don't develop this until an older age. You might get certain blood tests { antibodies} to document hsv esp if 1st time.