<prompt> A diabetic patient has black necrotic mass in nose, most likely causes is:MucormycosisAspergillusHistoplasmosisCandidiasis  <response>: Ans. is a i.e.Mucormycosis Mucormycosis is a fungal infection of nose and paranasal sinuses which may prove rapidly fatal if untreated.lt is seen in uncontrolled diabetes or in those taking immunosuppressive drugs.Treatment is by amphotericin B and surgical debridement.Remember :Most common fungal infection of nose is Aspergillosis Rhinosclerosis is caused by a bacteria Klebsiella not by Rhinosporidium Seeberi, a fungus Otomycosis is caused by Aspergillosis 