How long after getting your nose pierced before you can swim in lake?

Oh. Don't make my mistake. Simply refrain from entering any sort of public water type place until it is fully healed. If I were you I would wait 3 months, just to be safe. It will infect your piercing.

What happened to me was that it was the 4th week of my nose piercing, still relatively fresh. Thought it was OK to go swimming, so I did. A week later a keloid appeared and I wasn't able for the life of me to get rid of it. So instead i had to take the piercing out. So just don't go swimming, anywhere.

Common Sense:

Go right ahead and enjoy any public swimming facility you wish, just be sure once you are done swimming, clean the piercing in the shower. All public facilities are tested to ensure the water is safe, you use common sense and shower after using pools or Jacuzzis and you should have no issues (be sure to use soap when showering and rinse all piercings thoroughly) . Failure to clean or properly rinse a piercing will lead to the issues listed in the above statement.