I started getting rashes -red in color and in short horizontal lines on my back, mostly on my right side. the rashes come for no reason, but go away inan hour or so. Someimes they itch and burn . My hands, feet and thighs alos have some burning sensation sometimes. I checked mu sugar and it was less than 120. I took advil this morning, and so far no rashes, no burning or itching. Could this be a pinched nerve?