Dander and scabs on the edge of a cat’s ears may be caused by skin diseases such as cat moss or ear mites. First, check whether there are ear mites in the cat’s ear canal. If so, you can use ear cleaning solution to treat the cat’s ear mites; If there are no ear mites, it may be cat moss. You need to clean up the dander and scabs, and then apply or spray medicine to treat skin diseases every day. It will heal in about a month.