Ha. I love your illustration. More women should draw their vulvas when asking these questions. It really makes it a lot easier to understand. (But, heck, more woumen should draw their vulvas even if they aren't asking these sorts of questions!)

Are you having any sort of (new or different) vaginal discharge or a different smell? You might try applying plain, organic yoghurt to your vulva. It's very cooling, and if it is yeast, it will help to clear things up. My mom tries to tell me that I have sensitive skin, but I insist that she is wrong. Therefore, I find a drop or two of tea tree oil in a large spoonful of plain yoghurt applied to the vulva very calming for angry skin. If you know that your vulva is sensitive generally, you might not want to add the tea tree oil, but I find that it makes things feel cooler, and the actual coldness of the oghurt can help to bring down inflamation.