Mostly in children,occasionally in adults.Boys affected more often.
Spread from school,intitutions,barber shops,hats,etc.
Incubation period 2-4 days.
inflammatory or non inflammatory.
Ectothrix(outside hair)by T.Mentagrophytes,T.Verrucosum,M.Canis.
Endothrix by Tonsurans,T.Violaceum&T.Schoenleinii