The underarm, also known as the axilla, is the area located beneath the junction of the upper arm and the body. It contains various structures, including sweat glands, hair follicles, and lymph nodes. The skin in this region is sensitive and can be prone to irritation. Underarm hair typically begins to grow during puberty due to hormonal changes. Many people choose to remove underarm hair for personal or cultural reasons, often using methods like shaving, waxing, or laser hair removal. The underarm area is also a common site for applying deodorants and antiperspirants to manage body odor and sweat.