Just bought 2 guinea pigs from a local guy one had a bald spot on the top off his head what I thought was just because it might of been over groomed by the other piggies he had because it was night time thats all I seen,came home to realise it has a dry and scabby ear and a bald spot with red above his nose and cry skin behind his ears,could someone please tell me what it is and is there any home remidies to fix it, the other guinea pig had nothing like this I gave them all a bath to make sure it wasnt mites