204444ae_seases___Iowa_State_University__Name
[Etiology] Usually Microsporum nanum or Trichophyton verrucosum. [Signs - Lesions] Roughly circular, expanding hairless areas that develop crested scabs. Non-pruritic. [Comments] Usually self-limiting. Contagious to humans. Occasionally caused by other fungi. Usually seen in old swine and quite common in sows. [Name] 
Ringworm
Skin Lesions and Diseases | Iowa State University
Name