Hard Lumps Under the Armpit: Should You Worry?

There is a lump in the armpit?

I recently discovered a small round spot under my armpit.
I can't feel it by touching, but I can feel it when I press on it.
It is neither painful nor itchy.
Doctor, could this be a tumor? Thank you for your response.

Mi Mi, 10~19 year old female. Ask Date: 2018/03/23

Dr. Hu Ziren reply Oncology

It could simply be a subcutaneous lipoma or a sebaceous cyst.
It is advisable to monitor it and avoid constantly squeezing or touching it to prevent infection and inflammation.

Reply Date: 2018/03/23

More Info

When you discover a hard lump under your armpit, it can understandably cause concern. However, it's important to approach this situation with a clear understanding of what such lumps can signify. Based on your description of the lump being small, round, and not painful or itchy, there are several potential explanations, and not all of them are alarming.

Firstly, one common cause of lumps in the armpit area is swollen lymph nodes. The lymphatic system plays a crucial role in your immune response, and lymph nodes can become enlarged due to various reasons, including infections, inflammation, or even stress. If the lump is indeed a lymph node, it may be reacting to a minor infection or irritation in the body, which is often not serious.

Another possibility is the presence of a lipoma, which is a benign tumor made up of fat tissue. Lipomas are typically soft, movable, and painless, and they are generally harmless. They can occur anywhere in the body, including the armpit area.
Additionally, cysts can form in the skin or just beneath it, and these can also present as lumps. Epidermoid cysts, for example, are filled with keratin and can be found in various locations on the body, including the armpits. These cysts are usually not painful unless they become infected.

While the characteristics of the lump you described are not immediately concerning, it is essential to monitor it for any changes. If the lump grows, becomes painful, or if you experience other symptoms such as fever, night sweats, or unexplained weight loss, it would be prudent to seek medical evaluation. A healthcare professional may perform a physical examination and, if necessary, imaging studies or a biopsy to determine the nature of the lump.

In conclusion, while a hard lump under the armpit can be concerning, many causes are benign. It's crucial to observe the lump for any changes and consult with a healthcare provider if you have any concerns or if the lump changes in size, shape, or sensation. Regular check-ups and being aware of your body are key components of maintaining good health.

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