What on earth is that? \xa0A tiny stinging sore sits right on top of a joint on a toe. \xa0You have been wearing sandals on a warm summer day, hiking in the back country in a forest with small streams. \xa0You don't remember bumping it. \xa0This is a chilblain. \xa0They are common, yet most people know little about them. \xa0Listen and learn about these tiny irritating sores.\xa0