Parammary gland is a breast tissue that appears outside of the normal breast and is a congenital developmental abnormality. It has no normal effect on the organism, and its incidence is about 1% to 6%, often with a tendency of family history. This disease is more common in clinical practice, mostly in adolescent and fertile females, and can also occur in males. The parammary gland is also affected by endocrine secretion like the normal breast, and can develop the same diseases as the normal breast, such as paramastitis, lobular hyperplasia, cumulus cysts, and benign and malignant tumors. Because of its hidden location, it is easy to be misdiagnosed and mistreated clinically, so it should be taken seriously. Parammary glands are usually found in the upper part of the normal breast, such as the armpit and anterior axilla, and rarely in the lower part of the normal breast, such as the abdominal wall, groin, and vulva. It is rare that it occurs on the face, cheeks, ears, neck, back, arms and outer thighs, so it is also called ectopic mammary gland. Symptoms of parammary glands: 1. Periodic axillary swelling and pain: Most patients feel swelling and pain in the axilla before menstruation, during pregnancy or during lactation, and the pain increases when touched, but usually it is not obvious. 2, local lumps vary in size, mostly flat, soft to the touch, with a sense of stripes. 3.Many patients have small nipples and nipple overflow: some patients have small nipples in the axilla or chest, with or without parammary gland development. If not observed, they are often mistaken for moles. Very few patients see parametrial nipple overflow. Is the parammary gland more prone to cancer and does it need surgery? Like normal breasts, the parametrial glands are also affected by endocrine hormones and can be painful and too small to change with the menstrual cycle. Generally speaking, parametrial breasts are less likely to develop malignant lesions than normal breasts. In most cases, surgical removal is not necessary, but it is important to observe the changes in daily life and to seek medical attention in case of abnormalities.