Left arm.
Sources: I have read all the books and seen all the films.
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To see who comprises the Death Eaters, check the Harry Potter Lexicon. (http://www.hp-lexicon.org/wizards/death_eaters.html) The Death Eaters.
eBay has the biggest, and most inexpensive, collection of temporary dark marks.
In the Goblet of Fire, he is disguised as Professor Moody and sends up the Dark Mark at the Quiddich World Cup
Alex Crockford played him in Harry Potter and the Prisoner of Azkaban. Charlie was cut from the rest of the movies.
James and Oliver Phelps play Fred and George Weasley in the Harry Potter movies.