Seems that Demodectic mange looks nothing like what we see on this Deer.
Edmonton West Animal hospital described it's appearance thusly;
Quote:
Localized mange occurs when the mites proliferate in only 1 or 2 (some say up to 4) small, confined areas, usually on the animal’s face. The resulting isolated, scaly, bald patches look like a polka-dot pattern
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No where did I find any mention of skin darkening in Demodectic mange but I did find mention of it in sarcoptic mange cases.
I found extensive information on both from reputable sources. None of which mentioned either type of mange in Deer.
One report from Alberta Agriculture dealt specifically with Demodectic mange in Cattle. It claims that up to 15 percent of Alberta's cattle have the mites. But symptoms of the mites presence is far less common.
There seems to be at least one big difference between the two. Sarcoptic mange mites cause intense itching, Demodectic mange mites apparently do not.
In fact the documents I found say that Demodectic mange mites are present on most dogs but never manifest symptoms. Presumably because they don't cause the intense itching.
When symptoms do appear it's because of bacterial infection allowed in through the mites activity. Not due to the mites themselves.