From OpenwaterpediaBody markings (or race numbers) are generally numbers (and occasionally letters) that identify the race number of the open water swimmers or triathletes. The body marking (i.e., numbers and letters) can be written on their arms, backs (scapula), back of hands, swim caps and/or legs with a black marker or black ink stamp pad or with a temporary tattoo. The numbers can be outlined in white ink in order to make the numbers stand out more.
The body markings help officials identify athletes throughout the race.
 Body Marking Tan
Body marking or race numbers occasionally cause a body number tan (or body marking tan), a suntanning of the skin due to the sun's excess ultraviolet radiation around the part of the body where race numbers are located. In these cases, the skin where race numbers are printed on their bodies remains a lighter shade than the surrounding skin color.
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