by Amber Hilton

Created on: March 01, 2011   Last Updated: March 06, 2011

In general, folliculitis is defined as an infection of the hair follicles. This condition is caused by fungus or bacterium, often Staphylococcus aureus (a common cause of staph infections). The bacteria causes small whiteheads to form around the hair follicles, which can also develop into red bumps, pus-filled blisters and large swollen masses, depending on the type and severity of infection. The surrounding area may also become red and inflamed. It may cause itching, and in some cases it is painful too. Mild cases of folliculitis can be embarrassing or uncomfortable, while more severe cases can even cause permanent scarring and hair loss.

Experts at the Mayo Clinic recognize at least nine different types of folliculitis, which are categorized as either superficial or deep. Superficial cases of folliculitis usually clear up on their own in a few days, while deep folliculitis may be recurring and may require medical treatment. Certain types of superficial folliculitis are more commonly known as hot tub folliculitis and barber's itch. Deep folliculitis is more likely to cause pain and permanent scarring. Outlined below are the six forms of superficial folliculitis and three types of deep folliculitis.

Superficial folliculitis:

1. Staphylococcal folliculitis. Caused by staph bacteria, this type of superficial folliculitis causes white, pus-filled bumps that itch. It can occur anywhere on the body that has hair follicles. When it occurs on a man's beard area, it is referred to as "barber's itch." Shaving, scratching or a skin injury is a common way for staph bacteria, which are always present on the skin, to enter and infect the hair follicle.

2. Pseudomonas folliculitis (hot tub folliculitis). Caused by pseudomonas bacteria, this form of superficial folliculitis is characterized by round, red, itchy bumps that may look like a rash. Eventually, these red bumps may form into pustules that might crack and ooze. Hot tubs are just one environment where this type of bacteria thrives, thanks to unregulated pH and chlorine levels. It may be worse under your swimsuit, where the contaminated water was held against your skin.

3. Tinea barbae. This type of superficial folliculitis is caused by a fungus and once again affects men in their beard area. It is characterized by white, itchy bumps, and the surrounding area may be red and inflamed. More serious cases can include large, crusty pustules, fever and swollen lymph nodes.

4. Pseudofolliculitis barbae. Also affecting men's

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