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TINEA CORPORIS, CRURIS & PEDIS
Dermatophytoses are superficial fungal infections that have different presentations and are named based on location.
Tinea corporis (ringworm) usually presents with lesions of varying sizes, degree of inflammation and depth of involvement found on the trunk, extremities or face excluding the beard area in men.
Tinea cruris (jock itch) are lesions found on the groin. It may affect the proximal medial thighs and extend to the buttocks and abdomen. The scrotum and penis tend to be unaffected.
The red scaling lesions with raised borders have pustules and vesicles at the active edge of infected area.
Tinea pedis (athlete's foot) are lesions found in the interdigital spaces (most common), sole of foot, and sides of feet.

Diagnosis

Microscopy

  • Provides the most rapid means of diagnosis but may not always show positive in affected patients
  • Scale, hairs or debris are mounted in 10-20% Potassium hydroxide (KOH) soln & viewed under light microscope

Positive Microscopy

  • Hyphae (branching, rod-shaped filaments of equal width w/ lines of separation) & arthrospores will be visible

Laboratory Tests

Culture

  • Slow & expensive, results may take up to 4 wk; rarely indicated for diagnosis of tinea pedis, corporis or cruris
  • Results may be positive even when microscopy is negative
  • Allows accurate identification of organism
  • Culture studies are necessary for hair & nail fungal infections, infections unresponsive to regular topical treatment, unclear diagnosis, or when considering long-term oral therapy
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