Hello, I have questions about pigment spots. In my first pregnancy, I …

Hello, I have questions about pigment spots. In my first pregnancy, I didn't have them at all. After giving birth, around a month later, there was a black strip on the upper lip, like a mustache grew up as in men? It hasn't gone away yet. And a couple of weeks ago, spots appeared on my face. I smear it with cream, but no effect. Has anyone encountered something that helped? Or did it pass by itself?