Suggest Cure For An Infection On The Vagina

Hi Doc, it's been been five months that i feel some itchiness in the outer part of my vagina. I thought it's just my hair growing since I am shaving but then I found out there's a ringworm like on it ... I can't sleep every night coz it's itchy and after taking a bath its itchess too... Is it an STD or what do i need to do with it to stop or to cure it?