LIP RINGS HELP ASAP!!!!!!!!!!!!!!!!!!!!?

Okay so I have snake bites, I got them done like atleast 3 or 4 monthes ago. I usually wear studs but I prefer hoops. I have tried hoops tons of times but whenever I put them in the one side feels fine and the left side gets all swollen up and hurts.. why is this? they're fully healed and they never got and are not infected. I've tried various diffrent types of hoops too. help please? or some opinions?