Trichomycosis axillaris

Bacterial infection of the hair shafts in sweat gland-bearing areas

Trichomycosis axillaris is a superficial bacterial infection of the hair shafts in areas with apocrine sweat glands, such as the armpits and groin. It is caused by bacteria of the genus Corynebacterium, most commonly Corynebacterium tenuis.

Signs and symptoms

Trichomycosis axillaris is characterized by the presence of yellow, black, or red nodules on the hair shafts. These nodules are composed of bacterial colonies and can cause the affected hair to become brittle. The condition is often asymptomatic, but some individuals may experience hyperhidrosis (excessive sweating) or bromhidrosis (foul-smelling sweat).

Causes

The condition is caused by the overgrowth of Corynebacterium bacteria, which thrive in warm, moist environments. Factors that may contribute to the development of trichomycosis axillaris include poor hygiene, excessive sweating, and wearing tight or non-breathable clothing.

Diagnosis

Diagnosis is typically made based on the clinical appearance of the nodules on the hair shafts. A Wood's lamp examination may reveal fluorescence of the affected hairs. In some cases, a microscopic examination of the hair shafts may be performed to confirm the presence of bacterial colonies.

Treatment

Treatment of trichomycosis axillaris involves improving personal hygiene and reducing moisture in the affected areas. Shaving the affected hair is often recommended to remove the bacterial colonies. Topical antibacterial agents, such as clindamycin or erythromycin, may be prescribed to reduce bacterial load. In some cases, oral antibiotics may be necessary.

Prevention

Preventive measures include maintaining good hygiene, keeping the affected areas dry, and wearing loose-fitting, breathable clothing. Regular use of antibacterial soaps or washes may also help prevent recurrence.

Related pages

• Corynebacterium
• Bacterial skin disease
• Hyperhidrosis

References

Trichomycosis axillaris affecting the armpit hair.