“Do you need antibiotics after gum pinhole surgery?”

My guess would be “yes”, put the Periodontist will make that recommendation or not

Ask the surgeon who will do the surgery for a recommendation.
Antimicrobial rinse for sure.

Under normal circumstances, a dental patient does not need antibiotics after gum pinhole surgery. However, if there is any other underlying healthy issue(s)such as immuno-compromised, un-control diabetes, artificial heart valves or hip/ knee replacement and etc.that a patient has, or the surgical site is not healthy and has an existing infection that has not been controlled yet, then this patient will need antibiotics.