A 10-yr-old boy presented with painful boggy swelling of scalp, multiple sinuses with purulent discharge, easily pluckable hair, and lymph nodes enlarged in occipital region. Which one of the following would be most help ful for diagnostic evaluation?
C i.e. KOH mount
Biopsy and Giemsa staining
Bacterial culture
KOH mount
Patch test, Gram staining Tzank smear