A small nipple next to the armpit is considered to be paratesticular breast, usually there will be obvious paratesticular glands in the armpit, which is a kind of congenital developmental abnormality, and there are a lot of patients with bilateral occurrence at the same time, ultrasonography can be further clarified. The paratesticular breast is also benign, but if it gradually increases in size, it will not only affect the aesthetic appearance, but some patients will even have hyperplasia of the paratesticular glands, which manifests itself as regular pain and swelling. If necessary, surgical treatment can be chosen, according to the size of the lesion, the occurrence of the site can choose local anesthesia, or choose intravenous anesthesia, intravenous anesthesia relative to the cost of the operation is more expensive, should be the complete removal of the paratesticular breasts, but also need to carry out pathological examination. Although the paratesticular breast is a benign disease, if the history of the disease is relatively long, the gradual development of the evolution of malignant changes may also occur, and even the emergence of distant organs and axillary lymph node metastasis.