? Nowadays, many people have the experience of growing a lump under their armpits. Is it true? Let's have a look. According to experts, armpit pimples are more common in accessory breasts, and some are accompanied by pain, which changes with menstrual cycle. Generally speaking, accessory breast has the following symptoms: 1. Periodic swelling pain under the armpit: most patients have aggravated pain when touching, which is not obvious at ordinary times. 2. Local masses vary in size: most of them are flat, soft to the touch and have a sense of rope. 3. There are many small nipples and nipple discharge: some patients see small nipples under their armpits or chest, with or without accessory mammary gland development. If you don't pay attention to observation, you will often be mistaken for a mole. Few patients have seen accessory nipple discharge. Experts specially reminded that accessory mammary glands are also affected by endocrine like normal mammary glands, and diseases like normal mammary glands will occur, such as accessory mastitis, lobular hyperplasia, breast cysts, benign and malignant tumors, etc. Because of its hidden position, it is easy to be misdiagnosed and mistreated in clinic, which should be paid attention to. Accessory breast usually occurs in the upper part of normal breast, such as armpit and front part of armpit, and rarely occurs in the lower part of normal breast, such as abdominal wall, groin and vulva. Occurring in the face, cheeks, ears, neck, back, arms and outer thighs is rare, so it is also called ectopic breast. How is there a lump under the armpit? After the above introduction, it should be understood now. For auxiliary milk, it should be found and treated as soon as possible.