I just shaves around my anus for the first time, since then, multiple painful puss filled bumps appeared. i have protected sex, but could it be herpes?

See doctor ASAP: It would be helpful to know more. If the bumps arec exactly where you shaved and nowhere else, and started within a day or two, it's probably a superficial infection related to shaving. If they started 2-5 days after sex, and if the sex included contact with your anal area, herpes may be quite likely. Best to be examined ASAP; if herpes, diagnostic tests are most accurate within 1-2 d of onset.