how can my arms get lighter???
pull a michael jackson and get your skin bleached!!
aaha. jk. umm you could take an unbrella with you wherever you go and theres sun. or as neonunicorn said, you could wear long sleeves. but I think an umbrella is much more practical in the hot weather.
good luck, (:
as in "paler"??
put lemon juice on them for five mins a day and eventually you'll see a change.
keep your arms out of the sun..
just the simple stuff..
make up can help in that also. :)
keep them covered up.
wear sleeves when going outside (like for a farmers tan)