Brown spots on the skin near a cat’s ears are usually caused by ear mites or cat moss. First, you need to check whether there are ear mites in the cat’s ears. If there are ear mites, they need to be treated in time. You can clean the cat with ear cleaning solution regularly. If it is cat moss, you can dip a cotton swab into the medicine to treat fungus and bacteria, and then apply it on the brown spots on the skin. If it persists for a period of time, it will get better.