special ear

I think one of my ear is a "special" one.
everytime when i wear a plastic earring or some other types of earrings, just for a few days....my ear starts to get infected.
Only when I wear "real" ones, like gold, diamond, silver ones....then its ok.
strange ear i have, and its always the right ear thats giving me problem.
And now I have problem also, for wearing a dun know what material earring, and its infected again. waiting for it to heal now, so that I can put my earring back.