I know it's a personal question, but have you had
and itchy arse (bottom)? Do you have pets?
It can be "Enterobius Vermicularis" = common pin worm (thread worm). Mainly in Kids but adults do get it... especially where
population is in close contact and share amenities.. colleges, schools etc.
or if you have a pet, another possibility is Dipylidium caninum =Dog/Cat Tapeworm which can be passed to humans.. especially if
the pets have fleas.