Labia Majora Vaginal Cysts

So I have had a reoccurring problem over the past 3 years. I have been getting this cyst under the inside skin of my Labia Majora. It doesn't hurt and it's not visible from outside the skin, but I can feel it between my fingers. It has always gone away on it's own using warm compresses, but I can't figure out what it is. I don't have the resources to go to a doctor. Has anyone experienced something similar?