I turned the can upside down and sprayed my hand, white foam came out and i tried to wipe it off but it evaporated. I washed my hand, but I'm concerned because the can says it can cause frostbite. My hand seems to have circulation, but my finger feels a little sore/numb. And help please. DOCTORS?
Frostbite occurs when the tissue freezes. Late frostbite can result in the capilaries being frozen and loss of the apendage.
I would not worry too much about getting frostbite. The ammount on your hand most likely wasn't enough, though it did cause some surface freezing. The fact that you have circulation is a good sign.
Continue to monitor your finger for changes in discoloration / loss of circulation. If pain persists call your doctor. From the sounds of it you are fine.