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Worried About a Lump in the Armpit?

맘스외과성형외과 · *당신을 위한 맘스외과성형외과* · August 4, 2023

It can be comforting to look at ourselves and gain confidence, and it can also be a way to check our health. In that way, we quietly keep an eye on our own bodies. Sometimes, in th...

AI translation notice

This page is an English translation of a Korean Naver Blog archive entry. For exact wording and source context, verify against the Korean archive original and the original Naver post.

Clinic: 맘스외과성형외과

Original post date: August 4, 2023

Translated at: April 25, 2026 at 8:41 AM

Medical note: This translation does not guarantee medical accuracy or suitability for treatment decisions.

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It can be comforting to look at ourselves and gain confidence, and it can also be a way to check our health. In that way, we quietly keep an eye on our own bodies. Sometimes, in the process, we may notice something we do not like or find something suspicious.

You may feel the same way when you notice a symptom such as an armpit lump. In some cases, people can be startled when they feel a mass like this in their body. It can make you worry that something may be wrong with your health. That is why it is necessary to find out the cause accurately. Since it depends on the situation, getting a proper diagnosis and making a judgment is important, but in cases like this, an accessory breast can also be suspected.

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An accessory breast can be thought of as a remnant from the time when we were growing in our mother’s womb. A fetus looks different from us now. As each organ and body part gradually forms, by the time of birth it becomes the familiar human shape we know. A lot happens during that process. Among those changes, something unique occurs during breast development in females. If the body’s organs are still forming, the breast also gradually changes in order to take shape. In that process, at first, three to four pairs of mammary ridges are formed, running horizontally across the body. But by birth, only one pair should remain. The others are supposed to disappear. However, because the human body is not always formed perfectly like something stamped out of a mold, these remnants sometimes do not disappear, stay hidden, and then become visible as the breasts develop.

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If the armpit lump is an accessory breast, you may notice various uncomfortable symptoms. Pain that feels sharp and tingling, as well as swelling, can occur during menstruation or sometimes even in everyday life, and this is more common than you might think.

A person with an accessory breast may experience more severe breast engorgement during pregnancy and childbirth. That is because the mammary tissue hidden in the body is also affected by hormones, becoming denser and changing just like the original breasts. As a result, it can actually become more difficult. Even though it is tissue hidden under the arm and unable to fully function as a breast, it is still an extra breast, so breast-related conditions can also occur there.

In other words, if an accessory breast is present, the possibility of developing a condition may be somewhat higher. There are also cosmetic concerns. It can protrude like fatty tissue, and as time passes, just as the breasts sag, an accessory breast can also sag and become loose.

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There may be many people who look into and try different ways to improve this kind of situation. But there is one thing that must be kept in mind: an accessory breast is not simply a lump of fat.

Of course, if in some cases it is formed only by excess fat, then liposuction or fat-dissolving treatment may be a good option. But what we properly call an accessory breast is based on the assumption that mammary tissue is present inside. Because this mammary tissue acts like a root, if only the fat is removed without eliminating it, the area may become bulgy again someday and discomfort may return. Therefore, an accurate diagnosis is necessary, and any unnecessary mammary tissue must be removed.

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If you feel a lump in the armpit along with pain, or if it hurts and feels more uncomfortable during your period, it may be a good choice to first get evaluated to see whether it is an accessory breast. If your upper body does not seem particularly overweight, but only the area around the armpit protrudes noticeably, that shape also deserves careful consideration. For those who have experienced pregnancy and childbirth, if the area became more saggy afterward and thus more noticeable, or if they suffered severe breast engorgement, that can also be a clue. If you are worried and keep thinking, "What if it is this?" then getting a definite diagnosis is the wise thing to do.

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It is important to remove or manage the accessory breast tissue itself, but the desire to have a smooth and attractive armpit is naturally also very strong.

An armpit lump or accessory breast can leave a bulging shape visible at all times, making activities like wearing sleeveless clothing quite bothersome and often leading to dissatisfaction with the shape of the upper arm. That is why it is also necessary to think carefully about finishing the area in a beautiful way. It should be refined into a line that feels satisfying and into a smooth shape.

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To properly improve an accessory breast, it is necessary to clearly remove the mammary tissue, which is the identity of the armpit lump located inside. That is why specialized know-how is needed. Although mammary tissue itself is attached beneath the skin, beneath it are important structures such as the muscles, blood vessels, and lymph nodes that naturally exist in the armpit. So in fact, it is a very delicate area that must be handled with great care. However, since leaving any fragments behind must also be avoided, removing it cleanly as one whole piece becomes extremely important. For that reason, it may be possible to use ultrasound to check the internal condition and use a solution to separate the layers in advance.

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No matter how much you may be concerned about an armpit lump, the problems each person has will be different. In some cases, only the mammary tissue is especially developed and there is not much visible change on the outside, while in other cases both the mammary tissue and sagging skin are clearly observed. There are also cases where the skin is significantly loose. Because the necessary measures differ in each situation, the solution must be carried out accordingly. Therefore, it is important to get a definite diagnosis and to value the process that follows. If you are troubled by this, you should actively seek consultation and, together with an accurate diagnosis, find the right way to improve the situation.

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