Burn mark on James Garner's neck ?

I've only seen this flick once, at the old Cinestage Theater in Chicago during its first run. (The theater later became a porno house, and is now part of the Goodman Theater in Chicago's downtown live theater district.) Anyway, as I recall, at the end, Garner is on an empty track reflecting on his life and career. There is a noticeable rough spot about the size of a half dollar on his neck. A real burn that happened during filming, or, an added bit of makeup for realism ?