My big toenails are growing unevenly. They re following the normal contour of the toe however the center grows back more slowly or sometimes not at all, resulting in a flat U shape, where the outsides require trimming while the center does not. I did experience a nail bed infection a few years ago however that has been cleared up for some time and the rest of the foot seems unaffected. It isn t painful or uncomfortable, just a little disconcerting.