Itchy vagina with discharge, doctors have taken swab and all normal? what else could it be?

Depends: When you are saying swab, that doesn't exactly tell me what tests were done. Sometimes a swab means wet mount, a test that doctors do in there office, but that ma not be as accurate as other tests such as affirm (vaginal pathogen test). Also, a swab can be pap smear that doesn't detect sexually transmitted disease other than hpv, so i need to know what has been done to guide you further.

Could be allergic rx: And u have to make sure the culture tests for everything, i will bet they didn't test it for all possible causes and is the itch on teh inside or outside or both because differnet things can cause problems on teh outside than on teh inside or sometimes it could be the same.