Lumps Under the Armpit: Causes and Concerns

There is a hard lump in the armpit?

Hello Doctor, I have a lump under my left nipple that varies in size; sometimes it is larger and sometimes smaller.
It only causes mild pain when touched, so I haven't paid much attention to it, and I'm not sure how long it has been there.
Recently, I noticed a lump in my right armpit that is noticeably painful.
When I raise my arm, it is clearly visible and has an elongated shape, approximately 0.5 cm in width.
I am troubled by the pain in my right armpit and am unsure if it is related to the lump in my left breast or if it could be something serious.
I hope you can provide some answers.
Thank you.

Xiang, 10~19 year old female. Ask Date: 2022/01/18

Dr. Chen Sirong reply Oncology

Xiang / 19 years old / Male
Hello,
1.
I am unsure if the lump in my left chest is related?
A: It is likely not related; the chances of them being two independent events are greater.
2.
Could it be something serious? I hope the doctor can clarify.

A: Certainly: The lymphadenopathy is still in the inflammatory phase, which may cause redness, swelling, heat, and pain.
As for the cause of the lymphadenopathy, it cannot be determined definitively: it could be due to vaccination, asymptomatic cold, etc.
There is also a possibility of cancer, but the likelihood is lower at your age.
If, after three months, no other enlarged masses are found and the lump in your armpit has not increased in size or has even decreased, it should be considered unlikely.

Thank you for your inquiry, and I wish you a Happy New Year.
Taoyuan Hospital
Dr.
Chen Si-Rong

Reply Date: 2022/01/18

More Info

When it comes to lumps under the armpit, there are several potential causes that can range from benign to more serious conditions. Given your description of a lump beneath your left nipple that varies in size and occasionally causes mild pain, along with a more painful lump in your right armpit that is clearly visible when you raise your arm, it is important to consider a few possibilities.

1. Lymphadenopathy: One of the most common causes of lumps in the armpit area is swollen lymph nodes, which can occur due to infections, inflammation, or malignancies. The lymph nodes can swell in response to infections in the body, such as a cold or flu, or localized infections in the breast or arm. If the lump in your right armpit is painful, it may indicate an active inflammatory process.

2. Cysts: Sebaceous cysts or other types of cysts can develop in the armpit area. These are usually benign and can fluctuate in size. They may become painful if they become infected or inflamed.

3. Fibroadenomas or Breast Tissue Changes: The lump under your left nipple could potentially be a fibroadenoma, which is a benign tumor of glandular breast tissue. These lumps can also change in size and may be tender at times.
4. Infections: Conditions such as hidradenitis suppurativa, which is a chronic skin condition that causes lumps in areas where skin rubs together (like the armpits), can lead to painful lumps and should be evaluated by a healthcare provider.

5. Malignancy: While it is less common, lumps in the breast or armpit area can sometimes indicate breast cancer or lymphoma. The presence of pain, especially if it is new or worsening, can be a concerning sign that warrants further investigation.

Given your symptoms, it is crucial to seek medical attention. A healthcare provider will likely perform a physical examination and may recommend imaging studies such as an ultrasound or mammogram to assess the nature of the lumps. They may also consider a biopsy if there is any suspicion of malignancy.

In the meantime, it is advisable to monitor the lumps for any changes in size, shape, or associated symptoms such as fever, night sweats, or unexplained weight loss, which could indicate a more serious condition. Avoid self-diagnosing or delaying medical evaluation, as early detection and treatment of any underlying issues are key to better health outcomes.

In summary, while there are several benign explanations for the lumps you are experiencing, it is essential to consult with a healthcare professional to rule out any serious conditions and to receive appropriate care based on a thorough evaluation of your symptoms.

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