Exactly.
OP, why would you even consider posting something like this in the first place? What is there to gain? It is just beyond my comprehension why people post certain pictures on the internet.
I think that even if the patient has no way at all of being identified and even the eyes are blacked out, if you don't have written consent to post the picture on the internet likely it would still violate HIPAA or a governmental or institutional regulation of some kind. Even though they gave you the picture they did not consent to it being shared with others. Also no matter what the case you can not disclose who this person is.
Personally, I would shred and discard the picture. As Rendar5 said, someone can find something wrong with it no matter what. You don't want to get in trouble with HIPAA, government, or institutional violations. Even the best intentions won't go unpunished in situations like this.