What Causes White Spot On The Iris With Severe Itching?

I ve noticed recently that a new whitish spot has appeared on my iris. As in a little whitish dot. I say whitish because my iris is fucking with the color a bit (I have brown eyes), but its there and it can be seen in pictures (I took a picture of my eye when I saw it). I don t think its lighting related. Its not in earlier pictures of this eye. I currently have lots of pictures of my eyes because I ve been documenting them. My eyes have been driving me nuts for over a month! This is the first time I ve seen actual visible change. Also, this eye (the one with the white dot) has been REALLY itchy, but its not pink (not even a little). Any ideas as to what s up?