I have a small round spot (about half the diameter of a pencil) or so, just above my eyebrow , I noticed it about a month ago and thought it was dirt or grease or something cause im a mechanic. I wiped it away and it was gone, so I thought. A day or so later I seen it there again. Wiped it away and it was gone again. Keeps coming back. Same place same size.Kind of brownish in color, flat to surface, no tenderness at all, any ideas on what it could be?