How Can Vaginal Lips Black Skin Growth Be Treated?

Hi doctor, im a 27yrs. Old. Working at a callcenter since about 8yrs now . I've have an extra growth of thickish black skin on the lips of my vergina, its been there for as long as I can remember.. It worries me now, that im going to married soon.... What is this thing, why is it and does it have any conciquences