I've had a pencil-eraser sized bump on the outside of my labia (where there is hair, not near the opening) for about 3 days now. it is not painful at all, but is very full of pus- I thought (and maybe still think) it could be an ingrown hair and in the process of checking have popped it many times; however, it has not appeared to get smaller. It is mostly white and gets slightly shiny if you stretch the skin. if you put pressure on it its not completely hard but is quite firm. any idea what it might be??