Which of the following is NOT a type of infection that can occur in a barbershop setting?

Cosmetic is not classified as a type of infection that can occur in a barbershop setting. Infections typically arise from pathogens such as bacteria, viruses, or fungi. Each of these pathogens can cause various health issues – for instance, bacterial infections can result from improper sanitation practices, viral infections can be passed through skin contact or contaminated tools, and fungal infections may stem from damp environments that encourage their growth.

In contrast, the term 'cosmetic' refers to products applied to the body for beautification purposes and does not denote an infection or a pathogenic condition. Thus, while cosmetic procedures in a barbershop can sometimes lead to minor skin irritations or reactions to substances, they do not fall under the category of infections. This is why 'cosmetic' is the option that does not belong in the context of infections found in a barbershop setting.