Ever since I started getting my period, I've developed cysts and/or abscesses on the inner lips of my vagina. They generally occur within times of extreme stress or when my hormones are going crazy before my time of the month. I haven't had a professional diagnosis, but I have had two STD tests within the last ten years (my most recent one being back in April of 2017) and nothing has come up on those. These do drain, and sometimes they're so painful that I have to do it myself. Any ideas?