Hello, I've had this consistent tingle under my left shoulder blade for well over an year. It happens about three or four times a day and the duration varies. Recently I've started drinking only water due to new healthy life style choices and I've noticed it's decreased in rate, but just today I drank one cup of coca-cola and the tingle has hit me about five times. It used to drink soda all the time and it'd happen right afterwards. It feels like tiny ants walking over the same piece of skin under my left shoulder blade. It's not painful, it's just annoying. A couple months back I also had pains in that area along with the tingle but they dissapeared after awhile. My doctors dismissed it as being acne or hormones, what do you think?