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Chapters

0:00 Introduction
1:11 Causes of Folliculitis
2:01 Types of Folliculitis
3:46 Symptoms of Folliculitis
4:07 Diagnosis of Folliculitis
4:40 Treatment of Folliculitis


Folliculitis is the infection and inflammation of one or more hair follicles. The condition may occur anywhere on hair-covered skin. The rash may appear as pimples that come to white tips on the face, chest, back, arms, legs, buttocks, or head.[1]
rash (reddened skin area)
itching skin
pimples or pustules located around a hair or follicle; may be confused with chicken pox
may crust over
typically occur on neck, armpit, or groin
may present as genital lesions
spreading from leg to arm to body through improper treatment with antibiotics

Complications

Condition can develop into a more severe skin condition such as cellulitis or abscess.[1]
Causes

Most carbuncles, boils, and other cases of folliculitis develop from Staphylococcus aureus.[1]

Folliculitis starts with the introduction of a skin pathogen to a hair follicle. Hair follicles can also be damaged by friction from clothing, an insect bite,[2] blockage of the follicle, shaving, or braids that are very tight and close to the scalp. The damaged follicles are then infected by Staphylococcus. Folliculitis can affect people of all ages.[citation needed]

Iron-deficiency anemia is sometimes associated with chronic cases.[citation needed]
Bacterial

Staphylococcus aureus folliculitis[1]
Hot-tub folliculitis is caused by the bacterium Pseudomonas aeruginosa.[3] 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 - the legs, hips, chest, buttocks, and surrounding areas. Symptoms are amplified around regions that were covered by wet clothing, such as bathing suits.
Sycosis vulgaris, sycosis barbae, or barber's itch is a staphylococcal 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.[4]

Fungal
Main article: Fungal folliculitis

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 [1]

Viral

Herpetic folliculitis is rarer, but may occur when herpes simplex virus infection spreads to nearby hair follicles appearing in groups or clusters[1] mostly around the mouth.

Noninfectious

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 the scalp. Several hairs arise from the same hair follicle. Scarring and permanent hair loss may follow. The cause is unknown.
Reaction to Demodex mite infestation may occasionally be misdiagnosed as folliculitis.
Folliculitis keloidalis scarring on the nape of the neck is most common among males with 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, and sheep shearers. Even makeup may cause it.
Malignancy may also be represented by recalcitrant cases.[5]

Treatment

Most simple cases resolve on their own, but first-line treatments are typically topical medications.[1]

Topical antiseptic treatment is adequate for most cases.
Topical antibiotics, such as mupirocin or neomycin/polymyxin B/bacitracin ointment may be prescribed. Oral antibiotics may also be used.
Some patients may benefit from systemic narrow-spectrum penicillinase-resistant penicillins (such as dicloxacillin in the US or flucloxacillin in UK)
Fungal folliculitis may require an oral antifungal such as fluconazole. Topical antifungals such as econazole nitrate may also be effective.[1]