Welcome to the forum!
If it doesn't hurt and it doesn't itch, I'm willing to bet that is a case of "stork bite" Most people, especially guys, have it on the center nape of their neck in the "duck tail" area. It's just a slight discoloration of pigmentation, but nothing to be alarmed over. But, if you're OCD, you might look into getting some bleaching cream or maybe some concealer.