So in very rare circumstances, errors with a person's genetic code can result in some very interesting physical abnormalities. And it's still unclear why this happen to some people and most of us are still puzzled.
But in this case, whether its medical or witchcraft, these people unfortunately cannot be helped because of their rare sickness. Doctors are not prepared for such patients which is highly unfortunate. So there is no cure for them and they're likely to remain this way for the rest of their lives.