Help!

Has anybody had a "cut" on the opening of their vagina that doesnt seem to heal? Got one about a month ago and looks more so like a crack and now when we try to have sex,which weve limited and havent done often or in weeks,and now it feel like a stretching feeling and I still have the cut so that burns and the opposite side looks like it has a cut also and hurts. Making an appointment tomorrow just wondering if anyone has experienced this or something similar