I have attached pic of my dark brown flat spots on inside of my lips. It's been there more than 3yrs. I started to notice only after marriage. And also having infertility issues for past 3yrs. Before covid period I had infertility treatment that time it was disappeared somehow. But now it's again coming. Do I need to get worried or it's just the hyperpigmentation. At 2019 we did blood test after denist asked to take in safer side. Results came everything is normal.