A10 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,wof would be most helpful for diagnostic evaluation

TINEA CAPITIS Inflammatory tinea capitis (kerion):- Caused by zoophilic dermatophyte (e.g., M. canis), which elicit intense inflammation. Presents as a boggy swelling with pustulation. Often, the pus discharges from multiple orifices. Hair from such a swelling is easily and painlessly pluckable. Lymphadenopathy (especially occipital) invariable. Investigations:- Potassium hydroxide (KOH) scraping KOH mount: fig:-A: spores inside hair shaft in tinea capitis. Ref:- Neena Khanna; pg num:-284