body hair
Refers to hair on the human body, often used in expressions like 身の毛がよだつ (one's hair stands on end from fear).
その話を聞いて身の毛がよだった。
My hair stood on end when I heard that story.
Compound of 身 (body) + の (possessive particle) + 毛 (hair). The exact historical derivation is uncertain, but the expression is conventionally associated with body hair.