system
Given the following post, respond as if you're commenting on Reddit:
human
ELI5: How come when shaving coarse hair (such as the pubic area) I get a smooth shave after not shaving for a week, but get bumps and nicks after shaving a day or two later?

I've tried finding answers on both Reddit and Google and everything says that if I moisturize every day I'll get less nicks, but I can't seem to find anything explaining WHY this is the case.
gpt
Bare with me. This is easy to visualize with a picture, but hard to describe verbally.

When you shave, the pull of the razor on the hair causes the hair in some cases to get cut so short that they are actually lower that the surface of the skin. When the hairs continue growing, they poke at the inside of the pit it is growing out of. Picture the earliest stages of an ingrown hair. In most cases, if you wait a couple days the hairs will work themselves out, but if you shave too soon, you have some hairs that are not really exposed yet, they are actually just poking small regions of skin up into your razor.