Lumps Under the Armpit: When to Seek Medical Advice

There is a hard lump in the armpit?

In the past, I experienced itching and swelling in my armpit from mosquito bites.
Recently, I suddenly felt a hard lump in the same area, approximately 1 cm x 0.5 cm in size.
It is oval-shaped, without redness or swelling, and it feels neither painful nor itchy.
I wouldn't have noticed it if I hadn't touched it; I might have previously mistaken it for a mosquito bite.
When I raise my arm, it is not very noticeable, but I can clearly feel the hard lump.
I am very concerned that it might be a serious condition.

Nìmíng, 10~19 year old female. Ask Date: 2018/03/22

Dr. Hu Ziren reply Oncology

It is likely just granulation tissue left from bites and scratching, so there is no need to worry too much.
Avoid touching or squeezing it frequently, as this could lead to re-inflammation and infection.

Reply Date: 2018/03/22

More Info

When it comes to lumps under the armpit, it's essential to understand the potential causes and when to seek medical advice. The presence of a lump in this area can be concerning, especially if it is new, persistent, or accompanied by other symptoms. In your case, you mentioned that the lump is approximately 1 cm x 0.5 cm, oval-shaped, and is not painful or itchy. It is also noteworthy that it appeared after you experienced an insect bite in the same area.

Lumps under the armpit can arise from various conditions, including:
1. Lymphadenopathy: The lymph nodes in the armpit can become enlarged due to infections, inflammation, or other medical conditions. This is often a response to an infection in the body, such as a cold or flu, or localized infections like a skin infection.

2. Lipomas: These are benign tumors made of fat tissue and are typically soft, movable, and painless. They are common and usually do not require treatment unless they cause discomfort or cosmetic concerns.

3. Cysts: Sebaceous cysts can develop in the skin and may feel like lumps. They are generally harmless and can be left alone unless they become infected or bothersome.

4. Infections: Sometimes, a lump can be a result of an infection, such as an abscess, which may require drainage and antibiotics.

5. Malignant Conditions: While less common, lumps can also be indicative of more serious conditions, including lymphoma or breast cancer, especially if there are other concerning symptoms such as weight loss, night sweats, or changes in the breast.

Given that your lump is not painful and does not exhibit signs of infection (like redness or warmth), it may be less concerning. However, it is crucial to monitor the lump for any changes in size, shape, or associated symptoms. If the lump persists for more than a couple of weeks, increases in size, or if you develop other symptoms such as fever, night sweats, or unexplained weight loss, it is advisable to seek medical evaluation.

In terms of medical advice, a healthcare provider may perform a physical examination and could recommend imaging studies, such as an ultrasound, to assess the lump further. In some cases, a biopsy may be necessary to rule out malignancy, especially if there are any concerning features.

In summary, while many lumps under the armpit are benign and not a cause for alarm, it is essential to remain vigilant. If you have any doubts or if the lump changes in any way, do not hesitate to consult a healthcare professional. Early evaluation can provide peace of mind and ensure that any necessary treatment is initiated promptly.

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