A farmer has an ulcer on a leg with indurated margin and multiple sinuses with discharging black granules. The likely diagnosis is
Actinomycotic mycetoma - white to yellow granules and filaments are thin. Mycotic mycetoma - black granules and filaments are stout. Ref: Textbook of Microbiology, Ananthanarayan and Paniker; 9th edition
Mycetoma
Scrofuloderma
Lupus vulgaris
Actinomycosis
mycology