Here's what you should do:
* Don't touch it! This will only make the situation worse.
* Clean it with saline solution or a mild antibacterial soap as recommended by your piercer.
* Avoid using harsh products like alcohol or peroxide, which can irritate the piercing.
* Apply a warm compress to the area for a few minutes several times a day. This can help reduce swelling and pain.
* Take over-the-counter pain relievers like ibuprofen or acetaminophen if necessary.
* If the swelling doesn't improve or gets worse after a few days, or if you experience any other symptoms like redness, discharge, or fever, see your doctor or piercer immediately.
It's important to remember that infections can be serious, so it's crucial to seek professional medical advice if your lip piercing is infected.