What is the cause of Trichomycosis Axillaris?

Trichomycosis axillaris, also known as trichobacteriosis is a superficial bacterial infection of the underarm hairs caused by Cornyebacterium sp.

What is the clinical presentation?
The disease is characterized by yellow, less frequently red and black concretion (hair-nodules) growing around the hair shaft. It primarily affects the axillary hair, but in rare cases it can involve pubic, scrotal or intergluteal hairs. The condition is asymptomatic and does not cause any discomfort.

Who does it affect?
It affects both genders and race equally. However humidity, obesity and poor hygiene are contributing factors to developing the disease.

How do we diagnose it?
Direct clinical examination is extremely helpful in diagnosing Trichomycosis axillaris. Wood lamp is also useful for diagnosis; it will show pale-yellow fluorescence.

What is the treatment?
Shaving the hair of the affected area is the most effective with adjuvant treatment with sulfur soaps and/or topical antibiotics (fusidic acid) is advisable,

Trichomycosis axillaris is a benign and asymptomatic disease without any complications. Patients seek medical attention due to the fact that they notice a change in their hair texture, odor and excessive sweating.

Written by: Naif Alalshaikh, medical student

References:

DermNet