I have a scab on my earring hole?

Ok so I'm really confused and don't know what to do about it It's been a couple days and I have a scab on my earring hole I mean its not infected and theres no swelling or anything...I have good quality earrings...14 carrot white gold! and I have no idea how I could have gotten the scabs I take good care of ears and everything...unlike my sister...but anyways I've had them pierced for about...1yr and 1/2 now I've never had a problem with my ears until now.....can you guys help? I would really appreciate it!