I've wondered the same thing, I can not shave for weeks and weeks and there isn't that much of a noticeable difference, but with my friends and other people the same age it seems to be quite the opposite.

there is no relation

beard growth is genetic, you either have the follicles or you don't

you can have clear skin all you life, and no facial hair at all, many east asian, and native americans are like this

you can also have acne on your face, and have a full beard density, many white people are like this