Eastern rat snake (Pantherophis alleghaniensis) showing signs of fungal infection. Obvious external abnormalities are an opaque infected eye (spectacle) and roughened, crusty scales on the snout. 

Eastern rat snake (Pantherophis alleghaniensis) showing signs of fungal infection. Obvious external abnormalities are an opaque infected eye (spectacle) and roughened, crusty scales on the snout. 

Eastern rat snake (Pantherophis alleghaniensis) showing signs of fungal infection. Obvious external abnormalities are an opaque infected eye (spectacle) and roughened, crusty scales on the snout. 
Eastern rat snake (Pantherophis alleghaniensis) showing signs of fungal infection. Obvious external abnormalities are an opaque infected eye (spectacle) and roughened, crusty scales on the snout. 
Photograph by D.E. Green, USGS National Wildlife Health Center​