I have a lump in (on?!) my labia and it's flipping painful! Noticed it a few days ago - how long before I take the shame and head down to my GP's? It's marble-sized, tender and making it pretty sore to sit down! I've been stressed out at work recently and am tired/run down at the moment - am assuming it's a big spot and will go away on its own but just not sure how long to leave it...