Ok, so my guy has developed a strange little mark on the skin just below the head of his penis. He'll have it checked by his doctor but it's got me curios and I'm wondering if anyone on here may have seen something similar. It showed up about 4 weeks ago or so and it's quite faint. it's maybe 4mm (approx. 3/16") in diameter. it is only VERY slightly darker than his skin colour and the perimeter is very slightly raised and darker than the center. It brings no discomfort; he says it doesn't feel any different from anywhere else. It's neither dry and flakey, nor oozy. It hasn't seemed to change in any way over the past few weeks. Any ideas?