a 1cm Hard Lump Underarm: Causes and Concerns - Oncology

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When you discover a hard lump under your arm, it can understandably cause concern. There are several potential causes for a lump in this area, and understanding these can help you determine the best course of action.

One common cause of a lump in the underarm area is a swollen lymph node. Lymph nodes are part of the body's immune system and can become enlarged due to infections, inflammation, or even more serious conditions like cancer. If the lump is tender and you have had recent infections, such as a cold or skin infection, this could be a likely explanation. The presence of white material when you pressed on the lump might suggest that it could be an infected cyst or an abscess, which can occur when a hair follicle becomes infected.

Another possibility is a sebaceous cyst, which is a non-cancerous bump beneath the skin. These cysts can occur when the sebaceous gland becomes blocked, leading to a buildup of sebum (the oily substance produced by these glands). Sebaceous cysts are usually painless, but they can become inflamed or infected, resulting in tenderness and the discharge of white or yellowish material.

In some cases, lipomas, which are benign tumors made of fat tissue, can also present as soft lumps under the skin. These are generally painless and slow-growing. However, if the lump is hard and painful, it is less likely to be a lipoma.

Given your description of the lump being hard, painful upon touch, and having a history of discharging material, it is crucial to seek medical evaluation. A healthcare provider can perform a physical examination and may recommend imaging studies, such as an ultrasound, to better understand the nature of the lump. In some cases, a biopsy may be necessary to rule out more serious conditions, including lymphoma or other malignancies.

In summary, while many lumps under the arm are benign and related to infections or cysts, it is essential to have any new or changing lumps evaluated by a healthcare professional. They can provide a proper diagnosis and recommend appropriate treatment, which may include antibiotics if an infection is present or a minor surgical procedure to remove a cyst or abscess.
In the meantime, avoid squeezing or manipulating the lump, as this can exacerbate inflammation or lead to further infection. Keep the area clean and monitor for any changes in size, color, or pain level. If you experience systemic symptoms such as fever, night sweats, or unexplained weight loss, seek medical attention promptly, as these could indicate a more serious underlying condition.