The armpits and groin are considered the smelliest parts of the body. This is because these areas have a high concentration of apocrine glands, which produce a thicker, milky sweat that is more likely to attract bacteria and cause body odor.
While other parts of the body, like the feet, can also smell, the armpits and groin are particularly susceptible to odor due to the combination of apocrine gland density and the presence of hair that traps moisture and bacteria.