After minimally invasive surgery for armpit odor, the hardness of the surgical site is the phenomenon of normal tissue proliferation after armpit odor surgery, or it may be scar hyperplasia. The odor of armpit odor is because the secretion function of the sweat gland in the armpit is abnormally vigorous, secreting a large amount of organic matter, which is decomposed by bacteria to produce the odor. The hardening of the skin in the armpit area about 2 weeks after the operation is caused by subcutaneous adhesion or hardening and hyperplasia of the fat and skin, which will be alleviated and gradually disappear after 1 to 3 months in general, and the elasticity of the skin will be restored. Exercising the armpit and shoulder after 3 weeks after surgery helps to restore the elasticity of the axillary skin and prevent contracture and adhesion. Some patients may be prone to keloid hyperplasia and formation of hard nodules at the surgical site because they are keloid. After minimally invasive armpit odor surgery, attention should be paid to wound care, avoid infection, avoid substantial activities, etc. If the hardness of the surgical site persists, it should be promptly consulted and treated according to the doctor’s instructions.