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Tinea of the groin
Infection starts in inguinal crease and spreads on to thigh. One or both sides involved. Many patients are unaware of infection. Fine scale is present over surface; well-defined scaling border shown.
Fungal infections slowly progress. The advancing border is red with a fringe of scale. To obtain a specimen for potassium hydroxide examination, scrape the border scale with a #15 surgical blade.
Think of Candida infections if patient presents with erythema in the groin extending to scrotum and thigh. Satellite pustules can occur with tinea; more common in acute yeast infection.