Doc,
I am 28 male, 6'1" 185 lbs, healthy athletic, no diseases or health concerns.
In the past 10 days I have developed a red, 0.5 inch oval-shaped patch of skin on the dorsal head of my penis (see pics). It doesn't look very dramatic, but the red patch has persisted for more than 10 days without changing and without me disturbing it. It is mostly smooth, slightly red, the skin in that spot appears shiny with a different texture than surrounding skin.