Derm2- Dermatophytosis

nodules to draining tracts

deep pyoderma, neoplasia, dermatophytosis

• Deep pyo: impression smears
• Neoplasia: histopathology
• Dermatophytosis: DTM

only 50% of Microsporum canis fluoresce under black light, so if there is no fluorescence, you can't rule it out; also some other things can cause fluorescence; if there is fluorescence, use these hairs to culture on DTM

DTM fungal culture (red color change from 7-10 days, but not later/ growth and color change at SAME TIME)- pluck hairs on the periphery of the lesion; toothbrush fungal culture (use this when you don't see specific lesions, but you're suspicious)

all cases need systemic treatment