If skin scrapings and fungal cultures are negative and the patient does not respond to appropriate antibiotic therapy, a skin biopsy is indicated to rule out other rare causes of these lesions (e.g. PF). | If skin scrapings and fungal cultures are negative and the patient does not respond to appropriate antibiotic therapy, a skin biopsy is indicated to rule out other rare causes of these lesions (e.g. PF). |