• Infection of the tissues around the nail (paronychia) is often mixed with pyogenic organisms, including pseudomonas, as well as yeasts such as candida. This condition occurs most frequently in those employed in the food industry and occupations where there is repeated exposure to a moist environment and minor trauma.
The index and middle fingers are most frequently involved.
• Infection of the nail plate itself occurs in fungal infections, which are commonly due to Trichophyton or Epidermophyton species.
Those living in the tropics may acquire infection with Scopulariopsis brevicaulis, which produces a black discoloration of the nail.
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