i was thinking about a site like this awhile back because it seems doctors typically only have a few data points on most matters. the site would almost be analogous to code review except you're posting symptoms and pictures instead of code, the result is that you get more sets of eyes on the problem. the only drawback is that the wrong diagnosis could be fatal whereas a bad checkin problem just breaks the build or ca…
btw this is an invitation for lawyers or legal experts to prove me wrong so i can go build this. i personally found a need for this type of site a while back for myself, of course i would take each person's feedback with a (larger) grain of salt and still consult my doctors.
a) All email support groups (that I belong to) have huge disclaimers at the bottom of every email announcing something like "This is a free and open discussion of health issues. This is not medical advice. Please consult your doctor...blah blah blah" to try to cover their butts.
b) A published author in the alternative health space actively encouraged me to adapt his own written disclaimer to put on my website to try to help me cover my butt. He has at least once been dragged before a medical review board/court/some such because of the information he disseminates. So, yeah, it's a real problem.
c) Privacy laws are a big deal and there are very big problems with encouraging people to post pics of symptoms, including how much of the body to show. I have seen a photo of a naked child (from the back) covered in a rash posted on a group and I think it was handled carefully by someone knowledgeable (the woman who posted it was herself a lawyer, so I imagine she knew what she was doing) but I can see this space being open to serious pitfalls in that regard.
d) I went and did the very rude thing of getting myself healthy when that is supposed to be impossible given my diagnosis. I have been repeatedly told that I am engaging in irresponsible, dangerous, evil behavior for talking about how I accomplished that, even though the path I followed is really incredibly conservative (for example: get informed about food chemistry because everything you put in your mouth has an impact on your body chemistry).
So, in short, there are some very big problems/challenges with your idea. Your concerns are real concerns, not neurotic worries at all. That doesn't mean it can't be done. But, no, there is no magic wand of "I talked to a lawyer and it's all okay now". You would have a lot of work to do to make this at all viable.