Corynebacterium xerosis is a normal resident of human skin and is typically not a concern. It can be grown on standard bacteriological media, such as:

* Blood agar: This is a rich medium that supports the growth of many bacteria, including C. xerosis.

* Chocolate agar: This medium is similar to blood agar but has been heated to lyse red blood cells, which releases nutrients that are particularly useful for fastidious bacteria.

* Nutrient agar: This is a simple medium that can be used to grow a variety of bacteria, including C. xerosis.

It's important to note that C. xerosis is not typically considered a pathogen and its presence in a culture is not usually cause for alarm. It's usually found as a commensal organism on the skin and in the environment.

If you are concerned about a C. xerosis culture, it's best to consult with a healthcare professional or a qualified microbiologist for proper interpretation of the results.