Armpit Lumps: Causes and When to Seek Help

Axillary lump

It seems that for about one or two weeks, I have developed a lump in my armpit.
It has become painful due to friction, which is why I found it strange.
When I press on it, it hurts, and if I press for a while and move it, the lump decreases in size, but after a short time, it quickly returns to its original size.
What could be happening? Is it just because it's too hot in the summer?

Yu, 10~19 year old female. Ask Date: 2016/04/13

Dr. Lai Yicheng reply Oncology

Dear Ms.
Yu,
Thank you for your letter.
In response to your inquiry: Based on the symptoms you described, I would like to ask if there is any correlation with your menstrual cycle.
Is the swelling and pain occurring only before and after your menstruation possibly related to endocrine factors? I recommend that you consult with a breast surgeon.
Sincerely,
Director Lai
Department of Radiation Oncology
Changhua Hospital

Reply Date: 2016/04/13

More Info

When it comes to lumps in the armpit area, there are several potential causes, and it is important to understand what might be happening in your case. Based on your description, it seems that you have developed a lump that has been present for about one to two weeks. You mentioned that it is painful when pressed and that it changes size with movement. Here are some possible explanations for your symptoms:
1. Lymphadenopathy: One of the most common causes of lumps in the armpit is swollen lymph nodes, which can occur due to infections (like a cold or flu), skin infections, or even localized infections in the arm or breast. Lymph nodes can become tender and swollen as they work to fight off infections.

2. Cysts: Another possibility is the formation of a cyst, which is a fluid-filled sac that can develop in various parts of the body, including the armpit. Cysts can sometimes become inflamed or infected, leading to pain and swelling.

3. Lipomas: These are benign tumors made of fat tissue that can form under the skin. They are usually painless and soft, but if they press on surrounding tissues, they can cause discomfort.

4. Infections: Skin infections, such as folliculitis or abscesses, can also lead to painful lumps in the armpit. These infections can be caused by bacteria, and they may require medical treatment.

5. Hidradenitis Suppurativa: This is a chronic skin condition that causes lumps, abscesses, and scarring in areas where skin rubs together, such as the armpits. It can be painful and may require specific treatment.

Given that the lump has been present for a couple of weeks and is causing you pain, it is advisable to seek medical attention. Here are some signs that you should definitely consult a healthcare provider:
- Persistent Pain: If the pain worsens or does not improve over time.

- Rapid Growth: If the lump grows quickly or changes in appearance.

- Fever or Other Symptoms: If you develop a fever, chills, or other systemic symptoms, this could indicate an infection.

- Changes in Skin: If the skin over the lump becomes red, warm, or starts to drain pus.

- Unexplained Weight Loss: If you experience weight loss or other systemic symptoms without a clear reason.

In terms of treatment, it will depend on the underlying cause of the lump. If it is an infection, antibiotics may be necessary. If it is a cyst or lipoma, your doctor may recommend monitoring it or possibly removing it if it is bothersome.
In conclusion, while it is possible that the lump is related to the heat and humidity of summer, it is essential to have it evaluated by a healthcare professional to rule out any serious conditions and to receive appropriate treatment. Don't hesitate to reach out to a doctor, especially if your symptoms persist or worsen. Your health and peace of mind are important, and getting a professional opinion is the best course of action.

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