Hot, sometimes itchy, slightly swollen year-old ear piercing?

I got my earlobes pierced a year ago. A few weeks ago, the right one became itchy, swelled, and the earring would stick to my ear and I'd have to turn it to rip it away from the crust (nasty, I'm aware). It also hurt at times. It was oozing clear goo, and I hear infections have colored goo. So after a week that one cleared up. Now my left one is acting up. It started out oozing clear goo for a day or two, now it's hot, itchy, and painful and it stung when I cleaned it with rubbing alcohol. I'm wearing Lia Sophia earrings, and they say they've got the lowest nickel amounts that exist. What's wrong, and what do I do?