Suggest Remedy For Inflammation And Redness In Labia

hi i am just wondering if you can help me, i have had an inflamed, red labia for about 4 weeks now, i had unprotected sex about 2 months ago and got an sti test nd results came back clear, i was given some antiviral drugs just incase it was herpes but was given the all clear, so im presuming its not that, any ideas what it might be, i have no discharge or itchyness