Swelling around my nostril piercing?

Looks more like hypertrophic scarring from the second picture then it being swollen. Go have your piercer look at it to make sure and follow their recommendations for getting it to go down. It's likely that your piercing wasn't healed when you changed it and that has irritated it but if you had that bump going before you changed it then yeah, that's not swelling.

And PS, people...nose piercings don't reject. They don't. Just because a person's body doesn't like a certain type of jewelry doesn't mean it is rejecting. Learn the definition of rejection with piercings before throwing it out there.

Don't do anything drastic. If it's a problem then go speak to a local piercer who'll know what's happening and advise you for the best solution, a doctor's job isn't to pierce, a piercers job is. They know what they're doing and if you ever have any problems after any piercer should be happy to help you. :P nose piercings aren't actually that likely to reject, so don't panic, just see what they say to you and hope it'll get sorted out. In the meantime, as someone advised, keep it clean with sea salt soaks and leave it be otherwise.

You need to take it out your body is rejecting the jewlery in ur nose

Take it out your body is OBVIOUSLY rejecting it. A dr is just gonna tell you the same thing

Visit a doctor, this happened to my girlfriend

It's either infected or your allergic to it. Take it out. And dont put it bak in