My cat has tiny bumps on his ears. What are they and how to treat?

Carbon has milliary dermatitis. It is often caused by a reaction to insect bites like knats, or from allergies. Basically it is a skin infection/irritation. Usually it will clear up on its own if the cause is gone. You can clean the skin with a mild antibacterial pad and apply antibacterial ointment. If Carbon goes outside using a flea prevention product will help repell insects too. Allergies are often seasonal so as it cools off and the bugs and humidity go away this should resolve. If it gets worse an exam is recommended. Generally this is treated with steroids and antibiotics. Thanks for using Petco Pet Education Center, formerly Petcoach to help you care Carbon.