Suggest Medication For Itching And Pain Of The Vaginal Lips

hi i have had my period for 4 days now but i noticed yesterday that my vagina was really itchy and hurt when i went to the bathroom. i took a mirrir with me and saw small chunks of missing skin on the inside of my vagina lips. it burns when i go to the bathroom or shower. I asked my husband to check and he found another big chunk missing further inside. they are not pussing just deep chunks... i have no idea what this could be