IPhone shocks/hurts me when I rest my skin on it?

So, I have an iPhone 6S. Sometimes, when i'm laying in bed next to it, I like to lay my elbow/forearm/chin/etc on it. But, no matter what phone case I have, it always gives me this painful, sharp, shocking feeling like a bunch of tiny needles, even when not charging. Is this just the electricity, and if so, is there any way to stop it?

Phone addiction. Doctor don't know how to treat it these days.