Folliculitis

Folliculitis
Classification and external resources
ICD-10	L73.9 (ILDS L73.91)
ICD-9	704.8
DiseasesDB	31367
MedlinePlus	000823
eMedicine	derm/159
MeSH	D005499

Folliculitis is the inflammation of one or more hair follicles. The condition may occur anywhere on the skin with the exception of the palms of the hands and soles of the feet.

Causes

Most carbuncles, furuncles, and other cases of folliculitis develop from Staphylococcus aureus and Pseudomonas aeruginosa.

Folliculitis starts when hair follicles are damaged by friction from clothing, an insect bite,^{[citation needed]} blockage of the follicle, shaving, or braids too tight and too close to the scalp. In most cases of folliculitis, the damaged follicles are then infected with the bacterium Staphylococcus.

Iron deficiency anemia is sometimes associated with chronic cases.

Fungal

• Tinea barbae is similar to barber's itch, but the infection is caused by the fungus T. rubrum.
• Malassezia folliculitis, formerly known as Pityrosporum folliculitis, is caused by yeasts (fungi) of the genus Malassezia.

Bacterial

• Hot tub folliculitis is caused by the bacterium Pseudomonas aeruginosa.^[1] The folliculitis usually occurs after sitting in a hot tub that was not properly cleaned before use. Symptoms are found around the body parts that sit in the hot tub—typically the legs, hips, and buttocks and surrounding areas. Symptoms are typically amplified around regions that were covered by wet clothing, such as bathing suits.
• Sycosis vulgaris, Sycosis barbae or Barber's itch is a staphylococcus infection of the hair follicles in the bearded area of the face, usually the upper lip. Shaving aggravates the condition.
• Gram-negative folliculitis may appear after prolonged acne treatment with antibiotics.^[2]

Viral

• Herpetic folliculitis may occur when Herpes Simplex Virus infection spreads to nearby hair follicles - mostly around the mouth.

Non-infectious

• Pseudofolliculitis barbae is a disorder occurring when hair curves back into the skin and causes inflammation.
• Eosinophilic folliculitis may appear in persons with impaired immune systems.
• Folliculitis decalvans or tufted folliculitis usually affects scalp. Several hairs arise from the same hair follicle. Scarring and permanent hair loss may follow. The cause is unknown.
• Folliculitis keloidalis scarring on the nape of the neck, most common among males of curly hair.
• Oil folliculitis is inflammation of hair follicles due to exposure to various oils and typically occurs on forearms or thighs. It is common in refinery workers, road workers, mechanics, sheep shearers. Even makeup may cause it.
• Malignancy may also be represented by recalcitrant cases.^[3]

Symptoms

• rash (reddened skin area)
• pimples or pustules located around a hair follicle
  • may crust over
  • typically occur on neck, armpit, or groin area
  • may be present as genital lesions
• itching skin
• spreading from leg to arm to body through improper treatment of antibiotics

Treatment

1. Topical antiseptic treatment is adequate for most cases
2. Topical antibiotics such as mupirocin or neomycin containing ointment
3. Some patients may benefit from systemic narrow-spectrum penicillinase-resistant penicillins (such as dicloxacillin in US, or flucloxacillin in UK)
4. Fungal folliculitis can worsen with antibiotics and may require an oral antifungal such as Fluconazole. Topical antifungals such as Econazole Nitrate may also be effective.

See also

• Ingrown hair
• Boil

References

1. ^ MedlinePlus Encyclopedia Hot tub folliculitis
2. ^ "Severe Acne: 4 types". American Academy of Dermatology. Archived from the original on December 15, 2010. http://www.webcitation.org/5v07qRcEr. Retrieved December 15, 2010. 
3. ^ Folliculitis, follicular mucinosis, and papular mucinosis as a presentation of chronic myelomonocytic leukemia. Rashid R, Hymes S. Dermatol Online J. 2009 May 15;15(5):16.

External links

• Links to folliculitis pictures (Hardin MD/Univ of Iowa)
• Gladwin Medical Blog
• Malassezia (Pityrosporum) Folliculitis