Axillary parametrium is caused by the imbalance of the ratio of estrogen and androgen in the patient’s body, which is commonly caused by the imbalance of the ratio due to excessive secretion of estrogen or too little secretion of androgen, thus causing axillary parametrium. If it affects the patient’s daily life, it is recommended to go to the hospital for surgical removal in time to avoid further enlargement and even cancer. When patients find parastomal breast under the armpit, they can go to the hospital for ultrasound examination, as well as body estrogen to androgen ratio examination, which can clearly diagnose.