Persistent Lump Under My Armpit: What Could It Be? - Oncology

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A persistent lump under the armpit can be concerning, and it’s important to understand the potential causes and appropriate steps to take. Based on your description, the lump started small and then grew to about 1 cm in size over a short period. Initially, it was hard and painful to touch, but now it has softened and is no longer painful when pressed, although there is still some tenderness when pinched from both sides.

There are several possible explanations for a lump in the armpit:
1. Lymphadenopathy: The most common cause of a lump in the armpit is swollen lymph nodes, which can occur due to infections (like a cold or localized skin infection), inflammation, or even more serious conditions like lymphoma. The fact that your lump was painful initially suggests that it could have been related to an infection or inflammation.

2. Cysts: A sebaceous cyst or an epidermoid cyst can also present as a lump under the skin. These are usually benign and can fluctuate in size. They may become painful if they become inflamed or infected.

3. Lipoma: This is a benign tumor made of fat tissue. Lipomas are usually soft, movable, and painless, but they can sometimes become tender if they press against nerves or other structures.

4. Infection: If there was a localized infection in the area, it could lead to the formation of an abscess, which might start as a painful lump and then change in character as it resolves.

5. Other causes: Less commonly, lumps can be due to more serious conditions, including tumors (benign or malignant).
Given that your lump has persisted for several weeks without significant change and is now soft and less painful, it may indicate that whatever caused it is resolving. However, it is crucial to monitor it closely. Here are some recommendations:
- Observation: Keep an eye on the lump. If it continues to grow, changes in color, or becomes painful again, it’s essential to seek medical attention.

- Consultation: Since the lump has persisted for several weeks, it would be wise to consult a healthcare professional. They may perform a physical examination and possibly recommend imaging studies (like an ultrasound) or a biopsy if they suspect something more serious.

- Self-care: While waiting for your appointment, avoid manipulating or squeezing the lump, as this can lead to irritation or infection.
- Symptom Monitoring: Pay attention to any new symptoms that may develop, such as fever, weight loss, night sweats, or changes in your overall health.

In conclusion, while the lump under your armpit may not currently be causing significant issues, it is essential to have it evaluated by a healthcare provider to rule out any serious conditions. Early diagnosis and treatment are key to managing any potential health issues effectively.