Favus is caused by:
Favus is a form of tinea capitis in which there is formation of crusting lesions (scutula) in the involved region of the infection. It is most often caused by T. schoenleinii.
Mycology
Blockage of sebaceous duct
Staph aureus
Trichophyton schoenleinii
Trichophyton concentricum
Trichophyton schoenleinii