Subject: Why does salt and ice on skin mimic feelings of frosbite or burn?

A student of mine told me to sprinkle salt on my arm and to then hold a 
piece of ice on top of the salt.  He said it burned his arm.  After 
investigation I came to the conclusion that this was an endothermic 
reaction fueling itself from body heat, and giving you the sensation of a 
mild frostbite, not a burn. Even leaving a noticeable red place. What's up?

Re: Why does salt and ice on skin mimic feelings of frosbite or burn?