What Causes Ulcers On Vulva?

I have 2 small ulcer like places on my vulva one close to the vaginal opening and one close to the clitoris. Before they popped up the areas were very itchy and i may have scratched to much. I dont have a yeast infection. But i used to shave very frequently and i havent shaved in about 2 months and i have gotten this issue. Im also using Dial anti bacterial soap. The places are still itchy and i try to refrain from touching them. Also i am my partners first and he has not strayed. We have been together 4 years and i was tested to be safe. What could cause these ulcers? I have been under a bit of stress too if that helps.