My 88 yo father has had runny diarreah in the middle of the night for 2 days. The stool material is a caramel brown color, consistency of melted chocolate. Upon looking at the underpad there is a coral magenta pink shading where the liquid material spread. He is normally incontinent. He has never soiled the bed with BM before. He was at a SNF for 21 days before this and bowel movements were normal, solid, well formed and large. Any ideas what may be causing this. Other than this he is fine, good appetite, alert.