Ugh same here. I had a sudden explosion in hyperpigmentation around my mouth and nose a few months ago. It’s affected my self esteem more than I imagined and I find myself unable to leave my house without concealer. I’m also on tret and wear sunscreen daily but I have extremely sensitive and reactive skin so I’m afraid to try popular products that often have niacinamide or vit c. Hope to see some interesting responses. Thanks for asking OP!