Ok, sadly I have been out with buddies all to often and seen deer with HLS and had them say "oh that one must be shedding" or have been on various forums to read the same thing. We need to get people educated, because HLS is a very serious problem and is VERY easily identified. HLS likely causes the death of more deer annually than cougars.
Here is an example of a deer shedding. Things to notice, the deer looks kind of fuzzy like a kitten or kind of scruffy, but notice the deer still are completely covered in hair. :
Here are two examples of deer effected by HLS. Things to notice, a complete absence of hair over a portion of the torso (can also be the hind quarters and legs). The reason the hair is missing is because the mites/lice they are infected with cause an allergic reaction that causes them to itch constantly. The vigorous scratching and biting causes a loss of hair. You'll usually see white or yellow skin where the hair is missing. Generally does and fawns are effected. Rarely you will see a buck infected.
Here's more info from WDFW if you care to read more;
http://wdfw.wa.gov/conservation/health/hair_loss/index.html
