Trichomycosis axillaris

Trichomycosis axillaris is a superficial bacterial infection that affects the hair shafts in sweat gland–bearing areas, such as the armpits and the pubic area. It is a relatively common condition, but is often misdiagnosed because its symptoms can be easily confused with those of other skin conditions.

Causes

Trichomycosis axillaris is caused by the bacterium Corynebacterium, which is a type of Gram-positive bacteria. These bacteria are part of the normal skin flora, but can become pathogenic under certain conditions. The bacteria proliferate in the presence of sweat and sebum, leading to the formation of yellow, red, or black nodules on the hair shafts.

Symptoms

The primary symptom of trichomycosis axillaris is the presence of concretions on the hair shafts in the armpits or pubic area. These concretions are typically yellow, red, or black in color, and may be accompanied by a foul odor. Other symptoms may include itching and mild inflammation of the affected area.

Diagnosis

Diagnosis of trichomycosis axillaris is typically made based on the characteristic appearance of the affected hair shafts. In some cases, a microscopic examination of the concretions may be performed to confirm the diagnosis. This examination typically reveals the presence of Corynebacterium bacteria.

Treatment

Treatment for trichomycosis axillaris typically involves the application of topical antibiotics, such as erythromycin or clindamycin. In some cases, shaving the affected area may also be recommended. Good personal hygiene, including regular washing and drying of the affected area, can help to prevent recurrence of the condition.

See also

• List of cutaneous conditions
• Corynebacterium