a Painful 3cm Lump Under the Armpit: Causes and Concerns - Dermatology

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A painful lump under the armpit can be concerning, and it’s important to understand the potential causes and when to seek medical attention. The lump you described, which is hard and painful to the touch, could be due to several reasons, and I will outline some of the most common causes.

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 (like a cold or flu), inflammatory conditions, or even cancer. When lymph nodes are fighting an infection, they can become tender and painful. If you have recently had an infection, this could be a likely cause.

2. Infections: Skin infections, such as abscesses or boils, can also present as painful lumps. These are often caused by bacteria and can be accompanied by redness, warmth, and swelling in the surrounding area. If the lump is filled with pus, it may require drainage and antibiotics.

3. Cysts: Sebaceous cysts are non-cancerous lumps that can form under the skin. They are usually painless but can become inflamed or infected, leading to discomfort. These cysts are typically filled with a thick, oily substance and may require surgical removal if they become bothersome.

4. Lipomas: These are benign tumors made of fatty tissue. They are usually soft, movable, and painless. However, if a lipoma becomes large or presses on surrounding tissues, it may cause discomfort.

5. Hidradenitis Suppurativa: This is a chronic skin condition that causes lumps under the skin, often in areas where skin rubs together, such as the armpits. These lumps can be painful and may drain pus.

6. Malignancy: While less common, a lump in the armpit could be a sign of breast cancer or lymphoma. If the lump persists, grows, or is accompanied by other symptoms such as weight loss, night sweats, or fever, it is crucial to seek medical evaluation.


When to Seek Medical Attention
You should consider seeing a healthcare provider if:
- The lump persists for more than a couple of weeks.

- It grows in size or changes in appearance.

- You experience additional symptoms such as fever, night sweats, or unexplained weight loss.

- The pain worsens or does not improve with over-the-counter pain relief.


Diagnostic Steps
A healthcare provider may perform a physical examination and may recommend imaging studies, such as an ultrasound, to assess the lump further. In some cases, a biopsy may be necessary to determine the nature of the lump.


Conclusion
While many lumps under the armpit are benign and may resolve on their own, it’s essential to monitor the situation closely. If you have any concerns about the lump or if it is causing significant pain or discomfort, do not hesitate to consult a healthcare professional for a thorough evaluation and appropriate management. Early diagnosis and treatment can help address any underlying issues effectively.