This situation is usually caused by dirty or parasites in the cat's ear canal. Parents can take the cat to the hospital for a microscopic examination of the ear canal to determine what is causing the infection. If it is ear mites, anthelmintics are needed. Or use professional ear medicine to treat it. If it is a normal infection caused by dirty things, parents only need to clean it up.

Tip:

In order to keep cats’ ears clean, parents need to clean them every day, especially those cats whose ear canals are easily dirty.