Most carbuncles, boils, and other cases of<unk>  are infected with Staphylococcus aureus.<unk>  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, blockage of the follicle, shaving, or braids that are very tight and close to the scalp. The damaged follicles are then infected by Staphylococcus spp.<unk>  can affect people of all ages. Iron-deficiency anemia is sometimes associated with chronic cases. Bacterial * Staphylococcus aureus<unk>  * Hot-tub<unk>  is caused by the bacterium Pseudomonas aeruginosa. The<unk>  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<unk>  may appear after prolonged acne treatment with antibiotics. Fungal * Tinea barbae is similar to barber's itch, but the infection is caused by the fungus T. rubrum. * Malassezia<unk> , formerly known as Pityrosporum<unk> , is caused by yeasts (part of the fungus kingdom) of the genus Malassezia Mites *Demodex<unk>  is usually caused by an overgrowth of Demodex folliculorum a mite that lives in human hair follicles. Although most people with D. folliculorurm have no symptoms, the mite can reproduce excessively, particularly in people with oily scalps. Viral * Herpetic<unk>  is rarer, but may occur when herpes simplex virus infection spreads to nearby hair follicles appearing in groups or clusters, mostly around the mouth. Noninfectious * Pseudofolliculitis barbae is a disorder occurring when hair curves back into the skin and causes inflammation. * Eosinophilic<unk>  may appear in persons with impaired immune systems. *<unk>  decalvans or tufted<unk>  usually affects the scalp. Several hairs arise from the same hair follicle. Scarring and permanent hair loss may follow. The cause is unknown. *<unk>  keloidalis scarring on the nape of the neck is most common among males with curly hair. * Oil<unk>  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.
Folliculitis
Acne
Perifolliculitis
Bartholin's cyst
Tuberculous cellulitis
Molluscum contagiosum
Eosinophilic cellulitis
Pilonidal disease