I picked my duck up to dry her off after a swim and I think there is something wrong with her vent. It is brown, dry and crusty, kind of like a scab or when people have real dry chapped lips. I don't know what to do. I put her back into the water hoping a longer swim might loosen it up... any ideas of what is going on here. I will check my other female ducks. Please help if you know what is happening.