Your shouldn't because it might kill the good bacteria that is there to help your nose heal. :)
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Sure you can just remember that like any other cut or injury to your body you need to wash the piercings out once you are done swimming to ensure they stay healthy.
You can as long as you dont submerge the piercing. That could lead to a nasty infection.
its is 110% okay to go swimming after you get any piercing, because the chlorine cleans the piercing.