Why does my face not tan as nicely as the rest of me?

By the end of the summer, I am usually really tan. But my face always stays very pale. I’ve never gotten sunburn in my life. I always tan instead. It’s pretty nice. But on my face, I have very light freckles that just get darker in the summer. I like how the freckles and paler skin looks, but I look mis-matched! It’s weird! And by the way, I really don’t care about how I look or what people think of me, I just am tired of being mismatched. I probably won’t do anything about it, I’d just like to know why this is.