- Author: Nicholas V Nguyen, MD; Chief Editor: Dirk M Elston, MD more...
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.
Trichomycosis axillaris is a benign disease with no associated mortality or complications.
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.
Freeman RG, McBride ME, Knox JM. Pathogenesis of trichomycosis axillaris. Arch Dermatol. 1969 Jul. 100(1):90-5. [Medline].
Shelley WB, Shelley ED. Coexistent erythrasma, trichomycosis axillaris, and pitted keratolysis: an overlooked corynebacterial triad?. J Am Acad Dermatol. 1982 Dec. 7(6):752-7. [Medline].
Rho NK, Kim BJ. A corynebacterial triad: Prevalence of erythrasma and trichomycosis axillaris in soldiers with pitted keratolysis. J Am Acad Dermatol. 2008 Feb. 58(2 Suppl):S57-8. [Medline].
Bonifaz A, Váquez-González D, Fierro L, Araiza J, Ponce RM. Trichomycosis (trichobacteriosis): clinical and microbiological experience with 56 cases. Int J Trichology. 2013 Jan. 5(1):12-6. [Medline]. [Full Text].
Crissey JT, Rebell GC, Laskas JJ. Studies on the causative organism of trichomycosis axillaris. J Invest Dermatol. 1952 May. 19(3):187-97. [Medline].
Savin JA, Somerville A, Noble WC. The bacterial flora of trichomycosis axillaris. J Med Microbiol. 1970 May. 3(2):352-6. [Medline].
Kimura Y, Nakagawa K, Imanishi H, Ozawa T, Tsuruta D, Niki M, et al. Case of trichomycosis axillaris caused by Corynebacterium propinquum. J Dermatol. 2014 May. 41(5):467-9. [Medline].
Shelley WB, Miller MA. Electron microscopy, histochemistry, and microbiology of bacterial adhesion in trichomycosis axillaris. J Am Acad Dermatol. 1984 Jun. 10(6):1005-14. [Medline].