A few months ago, I started to notice a small patch of discoloration under
hair above my genitals, above and slightly to the sides of the base of my penis. Over the last few months, that discoloration has spread, so that it almost completely covers the skin under the - excuse me - "bush" area in an irregular, patchy, almost birthmark-like pattern. In fact, it looks like a birthmark - very light brown, almost coppery. It is not raised.