A child comes with a circular 3cm x 3cm scaly patchy hair loss with itching in the lesions. The investigation of choice is: (A) Split skin smear, (B) KOH mount, (C) Gram stain, (D) Tzanck smear
Answer is B. Itchy lesions over head with hair loss likely suggestive of Tinea capitis and KOH mount of hairs is the investigation of choice.