Hard Bumps on the Buttocks: Causes and When to See a Dermatologist

There is a hard lump on the buttocks that feels like there is some fluid inside when touched?

Hello, Dr.
Wu.
I have developed a hard lump on my buttocks.
It feels somewhat fluid-filled, similar to a blister, but the liquid inside is not as full as a typical blister.
Additionally, when I touch it, it has a foul odor.
I have squeezed it, and a colorless but very smelly fluid came out.
What could this situation be? If I go to the hospital, should I see a dermatologist?

Mr. Zhang, 20~29 year old female. Ask Date: 2015/08/29

Dr. Wu Yuxin reply Dermatology

It could be a cyst.
However, without seeing the actual condition, it cannot be confirmed, and further evaluation by a clinical physician is necessary.

Reply Date: 2015/08/29

More Info

When it comes to hard bumps on the buttocks, there are several potential causes, and understanding these can help determine the appropriate course of action. Based on your description, it sounds like you may be dealing with a sebaceous cyst or an infected cyst, which can present as a firm lump that may feel fluid-filled and can sometimes have an unpleasant odor, especially if there is an infection involved.

Sebaceous cysts, also known as epidermoid cysts, are common benign growths that occur when a hair follicle becomes blocked. They are typically filled with a thick, oily substance called sebum, which is produced by sebaceous glands. When these cysts become inflamed or infected, they can become painful, swollen, and may drain pus or a foul-smelling fluid. The presence of a foul odor, as you mentioned, often indicates that the cyst may be infected.

In terms of when to see a dermatologist, it is advisable to seek medical attention if you experience any of the following:
1. Pain or Discomfort: If the bump is painful or causing discomfort, it’s a good idea to have it evaluated.

2. Increased Size or Redness: If the bump is growing in size or becoming increasingly red, this could indicate an infection or other complications.

3. Foul Odor: As you noted, if the fluid being expelled has a strong odor, this could be a sign of infection that requires treatment.

4. Persistent Symptoms: If the bump does not resolve on its own or continues to recur, it’s important to consult a healthcare professional.

You should definitely consider making an appointment with a dermatologist. Dermatologists specialize in skin conditions and can provide a thorough examination, diagnosis, and appropriate treatment options. They may recommend treatments such as:
- Incision and Drainage: If the cyst is infected, the dermatologist may perform a minor surgical procedure to drain the cyst and relieve pressure.

- Antibiotics: If there is an infection, antibiotics may be prescribed to help clear it up.

- Surgical Removal: For recurrent or bothersome cysts, surgical removal may be the best option to prevent future occurrences.

In the meantime, it’s important to avoid squeezing or trying to drain the cyst yourself, as this can lead to further irritation or infection. Keeping the area clean and dry is essential, and if you notice any signs of spreading infection (such as fever or increased redness), seek medical attention promptly.

In summary, while hard bumps on the buttocks can be benign, your symptoms suggest that it would be wise to consult a dermatologist for a proper diagnosis and treatment plan. They will be able to assess the bump and determine the best course of action based on your specific situation.

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