For years now, ive had this white tough patch of skin on the inside of the left side of my septum about 1/4 in. if I leave it alone it starts to hurt after a day or two. But if I peel the top layer off of it, (which is almost a hard scale-like piece) it goes away, but returns a week later. When this first started, it was a small bump, but now its grown quite a bit (it only started growing about a month ago). What could this be?