What are common types of folliculitis?
Acne vulgaris occurs almost universally in teenagers at puberty. Acne vulgaris is usually not considered a folliculitis, but it specifically affects the hair follicles of the face, chest, and back.
Systemically administered or topically applied steroids (cortisone-containing medications) are a well-known cause of folliculitis. Certain anti-cancer drugs produce a form of folliculitis.
Cutting oil folliculitis
Machinists exposed to insoluble cutting oils that are used to decrease the friction while machining metal parts can develop a folliculitis on the exposed skin.
Staphylococci are bacteria that commonly inhabit the skin. One species, S. aureus, is a frequent cause of folliculitis. Occasionally, this organism may be insensitive to a number of commonly used antibiotics (such as methicillin-resistant Staphylococcus aureus, or MRSA). In this situation, it is very important that a culture of the organism with sensitivities be performed so the ideal antibiotic is selected to treat the infection.
Folliculitis from a fungus infection can occur on the face and on the lower legs. It is often exacerbated by shaving. It can also occur on the trunk (Pityrosporum folliculitis).
Folliculitis from a virus infection often affects the face and is from herpes simplex virus affecting the lips, commonly known as a cold sore.
Scarring scalp folliculitis
There are a variety of rare, inflammatory, scarring types of folliculitis that can result in permanent hair loss.
Eosinophilic folliculitis is an uncommon condition that is poorly understood and occurs occasionally as a response to certain drugs, in immunosuppressed patients (AIDS and bone marrow cancers), and in infants, affecting the scalp.