Taken from my log:

I have this very peculiar feeling in my middle to upper Trapezius area on the right side. Started feeling it last night after my workout, and it was the most noticeable when I was doing the seated rows tonight. It doesn't ache, sting, or even hurt for that matter. Doesn't seem to be affecting my performance. The closest I can get to describing the feeling is when a doctor gives you a shot after he has already pumped you full of Novocaine. It's a tingling kind of pinpointed pressure that only lasts for a second as I'm shifting my muscles.