If anything mine got browner then got blacker after topical dutasteride. Don't let the blue on my pfp deceive you, I dye it to get roles in cartoons and video games
Minoxidil is known to increase pigmentation and actually make it darker. I think other hair loss treatments don’t actually change the pigment, but make it appear darker due to thickness. But it is also a genetic process. I believe it is called hyperpigmentation or something like that.