Paramastomas, also known as paramastomas, are usually surgically removed because they can develop the same breast disease as the normal breast. The incidence of paratesticular malformations is 1% to 2%, and they are most commonly found in the armpits. According to the type of paratesticular breast tissue, it can be divided into 3 categories: 1. Complete paratesticular breast: paratesticular breast has complete mammary glands like normal breast, including nipple areola, etc. It grows and develops like normal breast, and lactation can occur during pregnancy. Complete paratesticular breasts have higher malignant potential than normal breasts and are usually treated by surgical excision. 2. Incomplete paratesticular breast: There is no mammary gland, but part of the normal breast tissue (nipple, areola, etc.) may appear. It does not grow and develop with hormonal changes and has no lactation function. The malignant rate of this type of paratesticular breast is lower than that of complete paratesticular breast, but it still has the possibility of malignant transformation, and surgery is recommended. 3. Acquired paratesticular breasts: also known as pseudo paratesticular breasts. This type of breast is usually formed when fat accumulates in the armpits due to the tightness of underwear. Surgery is usually not needed. Adjusting underwear, maintaining a normal weight and exercising properly can reduce the fat accumulation. If you have breasts, you should seek medical advice from a medical professional who can diagnose the condition and choose the best treatment for you.