A massage including the major portions of the body, i.e. the back, shoulders, legs, feet, arms, hands and neck, sometimes also including pectoral and gluteal muscles.
A sunburn or suntan focused on the left arm. It is caused by the left side of the body being the only half that gets exposed to sunlight while driving. Presumably, it would be located on the right side of the body in countries where they drive on the left side of the road.