It always cleared up really well with minimal treatment when I was pg, because your body is in a naturally induced immunosuppressed state (to allow the baby to grow). But within a few weeks of giving birth it always came back again - but never worse than what it was previously. After my 4th baby it was back within days of his birth and with a vengeance too. I've just started taking Methotraxate (immunosupressant) to treat it that way because I've also had a rather nasty flare up from an infection.