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Folliculitis

folliculitis

Folliculitis means an inflammation or infection of the hair follicles of the skin. Most of the skin is covered with tiny hairs which grow out of hair follicles. In folliculitis, many hair follicles in one area of the skin are affected.The affected hair follicles swell into small pus-filled pimples. Each individual pimple looks like a small, rounded, yellow-red spot.

Most cases of folliculitis are due to an infection with a bacterium (germ) called Staphylococcus aureus (S. aureus). This bacterium is carried harmlessly in the noses of many people, without causing any problems. Occasionally, other bacteria are the cause of folliculitis. Folliculitis usually occurs at sites where hair follicles are damaged by friction or shaving, or where there is blockage of the follicle.

Types of folliculitis

Folliculitis can occur anywhere on hair-bearing skin. There are a few specific types of folliculitis that deserve a mention:

  1. Sycosis barbae - this is the medical name for a long-term (chronic) folliculitis in the beard area of the face in men. It often affects the upper lip and it can be difficult to treat. The skin is painful and crusted, with burning and itching on shaving. Numerous pustules develop in the hair follicles.
  2. Hot tub folliculitis - as the name suggests, this tends to affect people who use hot tubs a lot. The hot water encourages bacteria called Pseudomonas spp. to grow (particularly if there is not enough chlorine in the water to keep it clean). Bathing in this 'soup' of bacteria can increase your risk of folliculitis. This type of folliculitis is generally harmless and is prevented by proper maintenance of hot tubs.
  3. Gram-negative folliculitis - this is a type of folliculitis that may occur after acne has been treated with long-term antibiotics.
  4. Pseudo-folliculitis - this is not really a true folliculitis. It does look similar, as little lumps form at the bases of hairs. These lumps do not contain pus. They are actually due to ingrowing hairs. Pseudo-folliculitis is more common in people with curly or Afro-Caribbean hair.

Folliculitis and other skin infections

Furuncles and carbuncles are the medical names for what you would call a boil. Both are bacterial skin infections, usually caused by S. aureus. A furuncle is a skin infection that involves the hair follicle and surrounding skin. Clusters of furuncles can join together under the surface of the skin, forming a carbuncle. A carbuncle means the infection has spread more deeply in the skin, and scarring is more likely.

What is the treatment for folliculitis?

It is important to shave in the direction of hair growth. Sometimes it is worth taking a break from shaving for a few days, to let the folliculitis settle down by itself. Keeping cool and keeping folliculitis exposed to the fresh air will also help. If you have folliculitis you should not share towels, flannels or razors.

Mild cases

Most cases or folliculitis are mild and do not need any treatment. It often clears without any treatment within 7-10 days. It may be helpful to use an emollient (moisturiser) which contains an antibacterial agent.

Localised folliculitis

For localised areas of folliculitis, an antibiotic cream may be useful. Fusidic acid is a suitable antibiotic cream that can be applied 3-4 times per day to affected areas.

More severe cases

If the folliculitis is more severe or widespread then a course of antibiotic tablets may be needed.

Recurrent or chronic folliculitis

Recurrent folliculitis is where the infection keeps coming back, although it disappears with treatment. The gaps between episodes may get shorter and, eventually, chronic (long-term) folliculitis is the result. In these cases, your doctor may take a swab from the skin where the folliculitis is. This swab can show what bacteria are responsible for the infection. If the swab confirms S. aureus, it is a good idea to take some more swabs, usually from the nose, to see if you are a carrier of this bacterium.

If you do carry staphylococci in the nose, and you get recurrent folliculitis (or if you have chronic folliculitis), this is likely to be the reason behind it. Treatment is to eradicate the staphylococci and prevent further folliculitis. This will usually involve three forms of treatment to be used at the same time. Firstly, a course of antibiotic tablets. Secondly, a course of an antibiotic nasal cream. Because the staphylococci may also be on other parts of the body, not just where the folliculitis is, it is also advisable to use an antiseptic skin wash or shower gel. Finally, you will need to have repeat swabs to confirm that you are clear of the bacteria - 3 clear swabs over a 3-week period will confirm the staphylococcal infection has been eradicated.

Are there any complications of folliculitis?

Uncommonly, infection in the hair follicle can spread deeper or to surrounding tissues, leading to furuncles or carbuncles. A generalised skin infection can occur called cellulitis. This can usually be treated with a course of antibiotic tablets. Occasionally, cellulitis can be more serious and spread. This may need antibiotics given directly into a vein in hospital, but this would be very rare to have happened because of folliculitis.

Can folliculitis be prevented?

Keeping your skin clean, dry and free from abrasions or irritations can help to prevent folliculitis. Certain people are more prone to infections, such as people with diabetes. If you have a medical problem that makes you more likely to get infections, these precautions may be more important. Keeping the skin moisturized can help protect it from damage. Take care when shaving, especially if you wet shave, using a shaving gel, foam or soap to lubricate the blades across the skin, and prevent nicks and cuts


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