Sudden Lump Near Perineum: Causes and When to Seek Medical Advice - Surgery

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Sudden swelling under the skin in the lower abdomen near the perineal area?


Hello, two days ago I suddenly felt a smooth, oval-shaped lump under the skin in my lower abdomen near the perineum.
It is painful when pressed (the pain feels similar to that of a deep pimple).
The longer side is about 2 cm, and it is not very noticeable on the skin's surface.
It is movable but feels somewhat firm.
Today, I have started to experience a slight pain even without pressure (not severe), and the skin appears to be slightly pink.
I am unsure what could be causing this or how to monitor it further.
At what point should I see a specialist? Also, my menstrual period started yesterday; could that have any impact? Thank you, doctor.

Ms. Chen, 30~39 year old female. Ask Date: 2022/04/30

Dr. Chen Bingze reply Surgery


Hello, this sounds like a cyst.
It is recommended to visit a nearby hospital for an in-person evaluation by a physician.

Reply Date: 2022/04/30

More Info


The sudden appearance of a lump near the perineum can be concerning, and it's important to approach this situation with caution. Based on your description, the lump is smooth, oval-shaped, approximately 2 cm in length, movable, and somewhat hard to the touch. Additionally, you mentioned that it is painful when pressed and has started to cause mild discomfort even without pressure, along with a slight reddening of the skin.

There are several potential causes for a lump in this area, and understanding these can help guide your next steps. Here are some possibilities:
1. Sebaceous Cyst: These are common and usually harmless lumps that can occur when a sebaceous gland becomes blocked. They can feel firm, may be painful, and can sometimes become inflamed or infected.

2. Abscess: If the lump is painful and has become red, it could be an abscess, which is a collection of pus that forms due to infection. Abscesses often require drainage and antibiotics.

3. Lymphadenopathy: Swollen lymph nodes can occur in response to infection or inflammation in the body. If there is an infection nearby, the lymph nodes in the groin area may swell.

4. Hernia: Inguinal hernias can sometimes present as a lump in the groin area, especially if there is discomfort or pain associated with it. This occurs when tissue protrudes through a weak spot in the abdominal muscles.

5. Tumors: While less common, both benign and malignant tumors can present as lumps in this area. Given your age and the characteristics of the lump, this is less likely but still a possibility that should be considered.

Given that you are experiencing pain and have noticed changes in the skin, it is advisable to seek medical attention. Here are some recommendations on how to proceed:
- Monitor Symptoms: Keep an eye on the lump for any changes in size, shape, or pain level. Note any additional symptoms such as fever, chills, or changes in bowel or urinary habits.

- Seek Medical Advice: It would be wise to consult a healthcare provider, preferably a primary care physician or a specialist in urology or general surgery. They can perform a physical examination and may recommend imaging studies, such as an ultrasound, to better understand the nature of the lump.

- Timing: If the lump continues to cause pain, increases in size, or if you develop systemic symptoms (like fever), seek medical attention sooner rather than later. If the lump remains stable and pain is manageable, you might consider scheduling an appointment within a week.

- Menstrual Cycle Consideration: While your menstrual cycle may not directly affect the lump, hormonal changes can sometimes influence the body’s response to inflammation or infection. However, it is still important to address the lump independently of your menstrual cycle.

In summary, while there are several benign explanations for the lump you are experiencing, it is crucial to have it evaluated by a healthcare professional to rule out any serious conditions and to receive appropriate treatment if necessary. Early intervention can often lead to better outcomes, so don’t hesitate to seek help.

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