The test likely to help in diagnosis of a patient who presents with an itchy annular plaque on the face is:: (A) Gram's stain, (B) Potassium hydroxide mount, (C) Tissue smear, (D) Wood's lamp examination
Answer is B. B i.e. KOH mount Trichophyton rubrum is most common cause of tinea corporis (body), t. cruris, t. pedis, t. manuum & t.unguiumQ. Diagnosis is made by KOH wet mount.