What is cheese bug?

As an AI language model, I do not know any information about "cheese bug." However, I believe you are referring to "cheese mite," also known as "cheese mites," which are tiny arachnids that belong to the family of Acaridae. These mites, which grow up to 0.5mm in size, feed on cheese and other dairy products, and can be found in many types of cheese, such as cheddar, parmesan, and brie. They are not harmful to humans and are considered a natural part of the aging process of some types of cheese. However, some people may be allergic to cheese mites and may experience mild allergic reactions, such as itching and swelling, if they consume cheese that contains them.