Tan Bing Song - Causes of Folliculitis

Written by: Tan Bing Song


A follicle refers to a crust or cavity from which the hair emerges on the surface of the skin. The term folliculitis is used to describe the inflamed condition of the hair. Depending upon the causal organism, folliculitis causes can be characterized as follows:

• Bacterial Folliculitis
• Fungal Folliculitis
• Viral Folliculitis
• Parasitic Folliculitis

<b> Bacterial folliculitis</b>
Bacterial folliculitis develops when bacteria enters the body through a cut, scrape, surgical incision, or multiplies in the skin near a hair follicle. The bacteria can get trapped and the infection may spread from the hair follicles to the other parts of the body.

Bacterial folliculitis may be superficial or deep. Superficial folliculitis, also called impetigo, consists of pustules which are small-circumscribed elevations of the skin containing pus. The pustules are often surrounded by a ring of redness. Deep folliculitis results when the infection goes deeper and involves more follicles to produce furuncles and carbuncles. These are more serious than folliculitis and can cause permanent damage and scarring to the skin.
Bacterial folliculitis usually occurs in children and adults. Staphylococcus aureus is the most common of bacterial folliculitis causes. It also causes sycosis, a deep chronic infection that involves the entire hair follicle.

Besides the species of streptococcus, pseudomonas, proteus and coliform bacteria have also been indicated as of bacterial folliculitis causes. “Hot Tub” Folliculitis is a condition caused by the pathogen pseudomonas aeruginosa. This disease is often caused due to unsanitary conditions at a spa. The pathogens identified in Gram-negative folliculitis include Klebsiella, Enterobacter, and Proteus species. This type of folliculitis sometimes develops in people receiving long-term antibiotic treatment for acne.

Some superficial follicle infections spontaneously resolve themselves. However, bacterial infections like impetigo, furuncles, carbuncles and “hot tub” folliculitis may not resolve spontaneously and generally require prescription therapy. All these infections are typically diagnosed by clinical presentation, after which predisposing factors are identified and eliminated.

<b> Fungal folliculitis</b>
As the name suggests fungal folliculitis is caused due to fungal infections. Superficial fungal infections are found in the top layers of the skin; deep fungal infections invade deeper layers of the skin. The infection from hair follicles can also spread to blood or internal organs.


The dermatophytic fungus, pityrosporum fungus and the yeast candida folliculitis are the prominent among the fungal folliculitis causes.

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