Painful Swelling in the Armpit: Possible Causes and Concerns

Redness, swelling, and pain in the armpit?

Hello Doctor, I discovered a lump under my armpit two days ago.
It feels uncomfortable when I press on it, and over the past two to three days, the discomfort has become more pronounced (it hurts even with light touch, and I have a sensation of something catching on my clothing, with a pulling pain when raising my arm).
I’m not sure if it’s just my perception, but the redness and swelling seem to have increased.
I tried to move it, but it doesn’t shift; I can’t just grab the surface skin.
It feels like a spherical mass beneath the skin, and the surface is relatively smooth, with a white spot near the center.
I’m wondering if this could be related to a lymph node issue, or if it could be influenced by the fact that I just started my menstrual period today.
Additionally, a few years ago, I noticed a similar lump under my armpit that felt like a mosquito bite, but it was completely painless and without redness or swelling, so I don’t remember if it disappeared or if it’s the same location as the current swollen area.
Since I’m seeking medical care abroad and it’s not very convenient, I would like to clarify some things before arranging a consultation.
Thank you for your time.

Lin, 30~39 year old female. Ask Date: 2020/07/09

Dr. Ye Qianyu reply Family Medicine

Hello! Based on your description, the redness, swelling, and pain in your armpit are acute symptoms that could be indicative of folliculitis or may progress to cellulitis.
Since I cannot conduct a physical examination and am unaware of the local healthcare resources, I strongly recommend seeking prompt medical treatment to prevent any complications.

Reply Date: 2020/07/09

More Info

The symptoms you are experiencing in your armpit, including the painful swelling and discomfort, could potentially be related to several underlying conditions. Given the description of a firm, ball-like structure that is tender to touch, it is important to consider a few possibilities.

1. Lymphadenopathy: One of the most common causes of swelling in the armpit area is lymphadenopathy, which refers to the enlargement of lymph nodes. This can occur due to various reasons, including infections (viral or bacterial), inflammatory conditions, or even malignancies. The presence of a white spot at the center of the swelling could suggest an infection or an abscess, particularly if there is associated redness and warmth.

2. Infection: If the area is red, swollen, and painful, it could be indicative of a localized infection, such as a skin infection (like cellulitis) or an infected hair follicle (folliculitis). Infections can cause the lymph nodes in the area to swell as they work to fight off the infection.

3. Cysts or Lipomas: Another possibility is the presence of a sebaceous cyst or a lipoma. Sebaceous cysts are generally benign and can become inflamed or infected, leading to discomfort and swelling. Lipomas are soft, fatty lumps that are usually painless, but if they become irritated or inflamed, they can cause discomfort.

4. Hormonal Changes: You mentioned that your menstrual period just started, and hormonal fluctuations can sometimes lead to breast and armpit tenderness or swelling. However, this is usually not associated with a firm, palpable mass.

5. Other Conditions: There are other less common conditions that could cause similar symptoms, including autoimmune diseases or even certain types of tumors.
Given the complexity of your symptoms and the potential for various underlying causes, it is crucial to seek medical evaluation as soon as possible. A healthcare provider can perform a physical examination and may recommend imaging studies (like an ultrasound) or laboratory tests to determine the exact cause of the swelling.
In the meantime, here are some general recommendations:
- Avoid Manipulating the Area: Try not to press or poke at the swelling, as this could exacerbate any underlying inflammation or infection.

- Warm Compresses: Applying a warm compress to the area may help reduce discomfort and promote drainage if there is an infection.

- Monitor Symptoms: Keep track of any changes in size, color, or pain level, and note any new symptoms that may arise.

In conclusion, while there are several potential causes for the swelling and discomfort in your armpit, a thorough evaluation by a healthcare professional is essential for an accurate diagnosis and appropriate treatment. Given your current location and the challenges of accessing healthcare, consider reaching out to a local clinic or telehealth service for guidance.

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