Trichomycosis axillaris is a relatively common superficial corynebacterial colonization of the axillary hair shafts characterized by the presence of adherent granular concretions and a benign clinical course. When the pubic hair is affected, the condition is referred to as trichomycosis pubis.  Shelley and Shelley noted the coexistence of erythrasma, trichomycosis axillaris, and pitted keratolysis and termed it the corynebacterial triad. 
Corynebacteria are gram-positive rods and a major component of the cutaneous flora. A warm and moist local environment contributes to bacterial overgrowth. Hyperhidrosis and poor hygiene are risk factors for disease.
No studies have assessed the frequency of trichomycosis axillaris in the United States.
In one study from the United Kingdom, trichomycosis axillaris was present in 27% of adult male students, and in the general population, 42% of male patients and 7% of female patients. Rho and Kim reported the corynebacterial triad in 13% of 842 Korean soldiers. 
No racial predilection is reported for trichomycosis axillaris.
Both sexes may be affected; however, trichomycosis axillaris appears to affect males more commonly, since most women shave their axillary hair.
Trichomycosis axillaris can affect any age group from puberty through adulthood.
Trichomycosis axillaris is a benign infection of the hair with no associated mortality or complications. Once treated, it may recur if preventive measures (eg, shaving, antibacterial soap, antiperspirants) are not taken.
Instruct patients with trichomycosis axillaris to keep the area dry and clean. Shaving or trimming axillary hair usually is beneficial.
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