A week ago I got my cartilage pierced with a piercing gun. It didn't hurt or get red at all after days, but yesterday it began to hurt and is now red?

PIERCING GUN PAIN. MAY I ASSUME THAT THIS WAS YOUR EAR? IT MAY BE INFECTED. TAKE YOUR PRETTY EAR BACK TO PIERCER OR TO YOUR PCP WHO MAY GIVE YOU AN ANTIBIOTIC CREAM OR PILL FOR THIS. SOON!