It is characterized by the presence of concretions along the hair shafts, clinically observed as yellow, and rarely as red or black nodules. These concretions derive from bacterial colonization along the hair shaft containing dried apocrine sweat with a cementing substance generated by the bacteria.
Trichobacteriosis axillaris
Trichomonas tenax
Alternaria tenuissima
Mycobacterium lepromatosis
Herpes gladiatorum
Epidermophyton floccosum
Elephantiasis nostras
Microsporum gypseum