Lumps in the Armpit: When to Seek Medical Advice

There is a hard lump in the armpit?

Hello, doctor.
I would like to ask you about a small hard lump that appeared in my armpit about three weeks ago.
It is located just below the area where hair grows in the armpit.
At first, it was painful, and I thought it was a pimple, so I didn't pay much attention to it.
After a few days, the pain subsided.
Today, on February 6th, I noticed the small hard lump again while feeling my armpit.
It doesn't hurt when I press or pinch it, and when I raise my arm, the lump protrudes slightly.
I'm not sure what it is or which specialist I should see for an examination.
Could you please help me with this? Thank you.

Mo Mo, 10~19 year old female. Ask Date: 2020/02/06

Dr. Hu Ziren reply Oncology

It may just be a sebaceous cyst or folliculitis.
It is advised not to squeeze or press on it repeatedly; just observe it.

Reply Date: 2020/02/06

More Info

When it comes to lumps in the armpit, it’s essential to understand that they can arise from various causes, some benign and others that may require medical attention. Given your description of a small, hard lump that initially caused pain but has since become painless, there are several possibilities to consider.

Firstly, one common cause of lumps in the armpit is swollen lymph nodes. The lymphatic system plays a crucial role in our immune response, and lymph nodes can become enlarged due to infections, inflammation, or other conditions. If the lump is indeed a swollen lymph node, it may have initially been tender due to an underlying infection, which could explain the pain you felt at first. As the infection resolves, the lymph node may remain enlarged for some time before returning to its normal size.

Another possibility is the presence of a sebaceous cyst, which is a benign growth that can occur when a hair follicle becomes clogged. These cysts are typically painless and can feel firm to the touch. They may also fluctuate in size and can sometimes become inflamed or infected, leading to discomfort.

Additionally, lipomas, which are benign tumors made of fat tissue, can also present as soft lumps under the skin. These are usually painless and can be moved slightly under the skin when pressed.

While many lumps in the armpit are benign, it is crucial to monitor any changes in size, shape, or associated symptoms. If the lump persists, grows larger, or if you experience other symptoms such as fever, night sweats, unexplained weight loss, or persistent pain, it is advisable to seek medical attention.

In terms of which specialist to consult, starting with a primary care physician is a good approach. They can perform a physical examination and may order imaging studies, such as an ultrasound, to further evaluate the lump. Depending on their findings, they may refer you to a specialist, such as a dermatologist for skin-related issues or an oncologist if there is a concern about malignancy.

In summary, while many lumps in the armpit are benign and may not require immediate intervention, it is essential to remain vigilant. If you notice any changes or have concerns about the lump, do not hesitate to seek medical advice. Early evaluation can provide peace of mind and ensure that any necessary treatment is initiated promptly.

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