Armpit hair refers to the hair that grows in the underarm area of the human body, specifically beneath the arms. This hair typically begins to develop during puberty as a natural part of human growth and hormonal changes. It serves several biological functions, including reducing friction between the upper arm and the torso, which helps prevent skin irritation. Additionally, armpit hair plays a role in the dispersal of body odors by trapping sweat and bacteria, which can influence social and sexual signaling. The presence and thickness of armpit hair vary widely among individuals due to genetic, hormonal, and cultural factors.

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