The role of armpit hair is mainly: to protect the skin, relieve friction, help sweat evaporation and so on. 1. Protect the skin: armpit hair can play a shielding, protective role of the armpit skin, can block the external bacteria, dust and other damage to the skin, to prevent local skin infections. 2. Relieve friction: when the human body for arm movement, the armpit of the surrounding skin will appear between the friction, friction is too long and too heavy, but also make the skin abrasion, and armpit hair can be very good to alleviate the friction of the skin force, to protect the skin from abrasion. 3. Help sweat evaporation: armpit hair is conducive to better sweat out of the body. All in all, armpit hair has a lot of benefits to the organism, and shaving armpit hair is usually not recommended.