What causes folliculitis?

Folliculitis is an inflammation of the hair follicles that can occur due to a variety of causes, which is why the option stating "infectious or noninfectious agents" is the correct answer. Infectious agents include bacteria, viruses, and fungi that can invade the follicles, leading to infection. For example, the bacteria Staphylococcus aureus is commonly associated with bacterial folliculitis.

Noninfectious causes may also contribute to folliculitis, such as friction from shaving, wearing tight clothing, and the use of certain skin products. These factors can irritate the hair follicles, resulting in inflammation without any infection being present. Because of this range of potential causes, it is crucial to understand that both infectious and noninfectious agents can lead to folliculitis, which makes the selected answer comprehensive and accurate.