Hard Lump Under Armpit: Causes, Symptoms, and When to See a Doctor - Oncology

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Dear Hua Hua,
Thank you for reaching out regarding your concerns about the hard lump under your armpit. It's understandable to feel anxious about any new growth or change in your body, especially when it comes to something that causes discomfort. Let's break down the potential causes, symptoms, and when you should seek medical advice.


Possible Causes of a Hard Lump Under the Armpit
1. Lymphadenopathy: One of the most common causes of a lump in the armpit is swollen lymph nodes. Lymph nodes can become enlarged due to infections (viral or bacterial), inflammation, or even cancer. Given that you mentioned a previous injury, it's possible that your body is responding to that trauma or an infection.

2. Cysts: Sebaceous cysts can form under the skin and may feel hard. They are usually benign and can occur anywhere on the body, including the armpit. These cysts can become inflamed or infected, leading to pain and discomfort.

3. Lipomas: These are benign tumors made of fat tissue. They are generally soft, movable, and painless, but in some cases, they can feel firmer and may cause discomfort if they press against surrounding tissues.

4. Infections: An infection in the area, such as a skin infection or an abscess, can lead to the formation of a painful lump. If the lump is red, warm, or has pus, it may indicate an infection that requires treatment.

5. Other Causes: Less commonly, lumps can be associated with more serious conditions, such as breast cancer or lymphoma. While these are less likely, they are important to consider, especially if the lump persists or changes in size or shape.


Symptoms to Watch For
- Pain: If the lump is painful, this could indicate inflammation or infection.

- Size Changes: If the lump grows larger or changes in consistency, this warrants further evaluation.

- Associated Symptoms: Fever, night sweats, unexplained weight loss, or fatigue could indicate a more systemic issue and should be evaluated by a healthcare professional.


When to See a Doctor
Given that the lump has been present for about a year and is painful, it is advisable to consult a healthcare provider. You can start by seeing a primary care physician or a dermatologist, as they can evaluate the lump and determine if further testing is necessary. If there is a suspicion of lymphadenopathy or if the lump is concerning, they may refer you to an oncologist or a specialist in infectious diseases.


Conclusion
In summary, while there are several benign explanations for a hard lump under the armpit, it is essential to have it evaluated, especially since it has been present for a significant amount of time and causes pain. Early evaluation can help rule out serious conditions and provide peace of mind.
Please do not hesitate to seek medical attention, as your health and well-being are paramount. Wishing you the best and a swift resolution to your concerns.

Warm regards,
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