Ok, so for like a week now i've noticed that when my back isn't up against something, i get this weird chilly/tingly feeling in this specific area of my back. i'd say its around midway on my left side. it doesn't necessarily hurt but its just a weird chilly sensation. i feel like if this was normal i would have noticed this long ago but this has only been happening for like a week. should i be concerned about this or is this just some weird thing? please help!