A mole suddenly growing on the sole of the foot is not uncommon in clinical practice. This condition is called an acquired pigmented mole, and is a relatively common condition like moles growing on other parts of the body. However, because the sole of the foot requires long-term and repeated friction and walking, this kind of mole must be surgically removed as early as possible. If it is not removed early, repeated friction and stimulation may lead to conversion to a bad direction. Therefore, there is no need to worry after a mole suddenly grows on the bottom of the foot, and it can be surgically removed in a regular and professional hospital dermatology department as early as possible.