Does anyone have any idea what the white patch on my nail could be? I've got them on and off for years and put them down to bad shoes (I wore heels daily when I was in the office) but that can no longer be it. I thought maybe toenail fungus but it looks very different to the pictures I have seen of that. I tried a treatment just in case but it doesn't seem to have done anything, although I don't think this is uncommon. I do run so maybe pressure from that? Any ideas?