Here's why:
* Location: Nipple hair is often finer and more sparse than the typical hair growth on the chest.
* Appearance: It's usually more noticeable around the nipple itself, rather than a broader area of the chest.
* Cultural Perception: "Chest hair" is usually associated with a more masculine, hairy appearance, and nipple hair doesn't usually fit that image.
So, technically, nipple hair is chest hair, but it's often treated differently in everyday conversation and perception.