I have had a small pea sized lump on my left outer labia-right next to the crease of where the inner thigh meets the vaginal area- for about a year. It's never been painful so I assumed it was just a mole--but recently it's turned red, looking similar to a pimple without the whitehead. I popped it and the only thing that came out was a little blood. I cleaned it with an alcohol pad. Now it is tender in the area. I have not been sexually active in years. What could it be? Thank you.