I'm almost positive my cartilage is infected. What should I do and is there anything I can do for the pain?

Ok so I got my cartilage pierced 2 weeks ago and I’m pretty sure it’s infected. its red and a little swollen. There is also a greenish discharge. It’s is extremely painful. I’ve been looking on the internet for answers and am getting mixed answers. I dont know what I should do? This is my first time having it pierced so I don’t know what is normal or if its something serious…. help!!!