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Skin Diseases and Disorders

Skin Diseases and Disorders

Skin is the first line of defense and encounters a variety of microbes. Some pathogenic strains are often the cause of a broad range of infections of the skin and other body systems. These conditions can affect people of all ages and may have different causes, including genetic factors, infections, autoimmune reactions, environmental factors, and lifestyle choices.
Gram-positive Staphylococcus spp. and Streptococcus spp. are responsible for many of the most common skin infections. However, many...

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Trichomycosis Axillaris: A Clinicoetiological Study.

Abinaya Kalimuthu¹, Devinder Mohan Thappa¹, Bhawana Badhe²

¹Department of Dermatology and STD, Jawaharlal Institute of Postgraduate Medical Education and Research (JIPMER), Puducherry, India.

Indian Dermatology Online Journal

|March 24, 2025

Summary

Trichomycosis axillaris, a bacterial hair shaft infection, predominantly affects young males and presents with pigmented concretions. The flava variant is most common, but specific bacteria remain unidentified.

Keywords:

Dermoscopy histopathology microbiological trichomycosis axillaris

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Area of Science:

Dermatology
Medical Microbiology

Background:

Trichomycosis axillaris (TA) is a prevalent superficial bacterial infection affecting hair shafts, primarily in the axilla.
It is characterized by the formation of pigmented concretions around the hair shaft, caused by various species of corynebacteria.

Purpose of the Study:

To investigate the clinical presentation, diagnostic features (Wood's lamp, dermoscopy), and microbiological/histopathological aspects of Trichomycosis axillaris.
To determine the frequency of the corynebacterial triad in affected individuals.

Main Methods:

A descriptive cross-sectional study was conducted on 78 patients diagnosed with TA.
Data collection included clinical examination, Wood's lamp examination, and microbiological/histopathological analyses.

Main Results:

The study population comprised predominantly young males (94.8%) with a mean age of 29 years.
The flava variant (96.15%) was the most common, exhibiting yellow fluorescence under Wood's lamp. Clinical symptoms included malodor, staining, and itching.
Histopathology confirmed bacilli, and cultures yielded diphtheroids (64.71%) and Staphylococcus (41.17%), though a specific causative agent was not consistently identified. Only 5.13% showed the corynebacterial triad.

Conclusions:

Trichomycosis axillaris primarily affects young males, often in rural settings during summer.
The flava variant is the most frequently observed type.
Current diagnostic methods do not consistently link specific bacterial species like diphtheroids or staphylococci to the cause of TA.