I've had this done to my feet before in Japan and China. One time it hurt and left a painful bruise for a couple days. Usually no problems or pain. Also no m

I've had this done to my feet before in Japan and China. One time it hurt and left a painful bruise for a couple days. Usually no problems or pain. Also no marks after the first couple times I had it done. Half the times I've had it done were with suction cups, not the glass and flame method that originally existed. I'm not sure it really did anything, but maybe.