She has rubbed all the hair off a ring about 3/16 of an inch wide all around both eyes. I quarantined her about a week and a half ago when I first noticed it. So far, no one else shows any similar symptoms. At first, her eyelids were swollen, not horribly, but noticeably, and a bit crusty. Now, they're not crusty, just bare. Tonight was the first time I saw her rubbing her eye. Her eyes don't have any discharge, and they're not bloodshot. She is active and alert as normal, but quite lonely. Any ideas? Diagnosis and/or treatment?