This has happened twice now in the past month or so. The skin toward the outer edge of my right middle finger tip splits wide open. Like someone took a sharp object and opened it up from the nail bed under the end of the nail forward. It's happened after a gig or a practice, but not that I played especially energetically. And there doesn't seem to be any sharp edge to my nail that cuts into the flesh. The calluses are pretty thick, but it stings anyhow. Putting a bandage on while it heals sux. Any idea what I may be doing wrong?