I haven’t experienced tears, but do you wear anything that rubs against that spot consistently? Or ride a bike/something similar regularly? Apparently those can cause tears. Thongs personally irritate the hell out of that area if I wear them any longer than a few hours.
To heal, I suggest avoiding anything that would irritate that area (such as the things I mentioned). You said it happens around your period, so do you use tampons? They can cause tears too, so maybe avoid them if you use them. Keep the tears clean and dry. Washing after using the bathroom is probably a good idea. It might be good to avoid using tp since it could irritate it as well. Sitz baths.