Hi last day i saw single tiny pinworm in my stool and haven't any symptoms .can i hangouts with my friends at weekends or should i quarantine myself?.i already started mebendazol?

True adult infections are rare when you are not exposed to young kids. You acquire it by ingesting eggs, shed from their bottoms, that somehow make it on your fingers. It does not pass easily in a social environment. Enjoy your life and don't think of this further.

For pinworms transmission check cdc.gov, strict hands hygiene usually suffices in preventing transmission, if having young children, becoming difficult, avoiding social events probably needed until all treated properly.

Assume you truly have pinworm, as long as you wash your hands with soap after using the rest room and avoid touching your behind, there is no need to put yourself in quarantine. Re-infestation is still a risk so you should take another dose of mebendazole in 2 weeks. However, I still wonder if you can really saw one tiny pinworm in the stool which is considered difficult to recognize.