The fleshy armpit is considered to be caused by the accumulation of fatty tissue in the local subcutaneous tissue, especially in postpartum or obese patients. In addition, the parametrium in the armpit is a congenital developmental abnormality that causes localized pain and discomfort, and even an obvious bulging mass. Ultrasound examination can further clarify the diagnosis, and regular follow-up and observation are necessary. For patients with simple adipose tissue hyperplasia, appropriate sports and exercise should be performed to burn body fat and strengthen the patient’s resistance. It is best to choose a low-salt, low-fat diet, stay away from fried foods and greasy foods, and have regular local ultrasound examinations.