If you have a bag under your breast, consider that it is caused by breast enlargement or breast lumps, or it may be caused by breast cysts or breast abscesses, and you need to go to the hospital for an examination to confirm the diagnosis. It is likely to be caused by autoimmune disorders, irregular lifestyle habits or chronic inflammation, so you should go to the hospital for a mammogram to find out where the disease is located and identify the cause. The reason for this is that you should be under the guidance of your doctor and not use drugs indiscriminately. Other causes may be bacterial infections that cause lumps in the patient’s breasts, and possibly lipomas. However, lipomas do not cause any major damage to the body, so they do not need to be treated, but it is important to observe their development, so it is best to visit the hospital every six months for examination. It is important to wear proper underwear and not to compress the breasts, otherwise it is also likely to stimulate the breasts to develop such condition.