What we have here is a classic ulcer. The body exposes itself, becoming raw flesh, in such a place to make you keep touching it, and by touching it hurting it, and by hurting it hurting you because you’re your body (of course). This – or really, you – makes you, helpfully, aware that something is wrong. And, as you can see, there is an ulcer right on the tip of this patient’s tongue. It is really like her tongue has no tip at all, and rather the wide muscle, usually so pliant and receptive, lying placidly in her mouth, has been subsumed by pain.