Small Bumps Under Your Left Armpit: Causes and Concerns

There are some small bumps under the left armpit?

There is a small bump under my left armpit that is flesh-colored, approximately 0.5 mm in length, and is not painful (it could possibly be a filiform wart, folliculitis, sebaceous gland inflammation, milia, or lymphadenopathy; I suspect it is milia).
Since the dermatologist could not determine what it is, I would like to see a surgeon.
What could this small bump be, doctor?

Rick, 30~39 year old female. Ask Date: 2015/06/18

Dr. Ke Fangxu reply Surgery

It is not possible to make a diagnosis based solely on a textual description; a personal examination by a physician is necessary.
However, small lumps on the surface of the skin are generally benign and usually do not require excessive concern.
Typically, surgical removal is not necessary.

Reply Date: 2015/06/18

More Info

When it comes to small bumps under the armpit, there are several potential causes to consider. Based on your description of the bump being flesh-colored, approximately 0.5 mm in size, and non-painful, it is important to differentiate between various skin conditions and other underlying issues.

1. Sebaceous Cyst: One common cause of small, flesh-colored bumps is a sebaceous cyst. These are benign lumps that form when a hair follicle or oil gland becomes blocked. They are typically painless and can vary in size. Sebaceous cysts are filled with a substance called sebum, which is produced by the sebaceous glands.

2. Folliculitis: This condition occurs when hair follicles become inflamed, often due to infection or irritation. Folliculitis can present as small red or flesh-colored bumps and may be itchy or tender. However, if your bump is not painful and does not exhibit signs of inflammation, this may be less likely.

3. Skin Tags: These are small, benign growths that can appear on various parts of the body, including the armpit. Skin tags are usually flesh-colored or slightly darker and can vary in size. They are generally harmless and do not require treatment unless they become irritated or bothersome.

4. Lipoma: A lipoma is a benign tumor made of fat tissue. They are typically soft, movable, and painless. While lipomas can occur anywhere on the body, they are less common in the armpit area.

5. Lymphadenopathy: Although you mentioned that you do not feel any lymph nodes or swelling, it is worth noting that swollen lymph nodes can sometimes present as small bumps. Lymph nodes can become enlarged due to infections, inflammation, or other medical conditions. If there are no accompanying symptoms such as fever, night sweats, or unexplained weight loss, this is less likely.

6. Molluscum Contagiosum: This is a viral skin infection that results in small, raised, flesh-colored bumps. They are usually painless and can resolve on their own over time. However, they are contagious and can spread through direct skin contact.

Given that a dermatologist was unable to provide a definitive diagnosis, it is wise to seek further evaluation from a surgeon or another specialist. They may perform a physical examination and, if necessary, a biopsy to determine the exact nature of the bump.
In the meantime, monitor the bump for any changes in size, color, or symptoms. If you notice any redness, swelling, pain, or drainage, it is important to seek medical attention promptly.
In conclusion, while the bump you described is likely benign, it is always best to err on the side of caution when it comes to skin changes. Consulting with a healthcare professional who can provide a thorough examination and appropriate diagnostic tests will help ensure that any underlying issues are addressed.

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