a Black Bump on the Buttocks: Causes and Concerns

There is a black bump the size of a marble on the buttocks?

When I was in elementary school, one day I suddenly experienced severe pain in my buttocks.
A few days later, I noticed a black raised lesion on my skin, somewhat resembling a mole, but large enough to affect my appearance.
What could that be? It doesn't hurt now, and I didn't have anything like that on my buttocks before.

Jack, 10~19 year old female. Ask Date: 2019/05/03

Dr. Wu Yuxin reply Dermatology

No lesions were observed, making it difficult to determine the issue.
If this is causing significant distress, please seek medical attention promptly.

Reply Date: 2019/05/03

More Info

When it comes to a black bump on the buttocks, there are several potential causes that could explain its appearance. The most common possibilities include benign conditions such as a seborrheic keratosis, a dermatofibroma, or a mole (nevus). However, it is essential to consider other factors, especially if the bump has changed in size, color, or shape, or if it has caused any discomfort.

1. Seborrheic Keratosis: This is a non-cancerous skin growth that often appears as a brown, black, or tan bump. They are usually round or oval and have a waxy, scaly surface. These growths are common in older adults and can appear anywhere on the body, including the buttocks.

2. Dermatofibroma: This is another benign skin tumor that can appear as a firm, raised bump on the skin. They are often brownish in color and can be mistaken for moles. Dermatofibromas are usually harmless and do not require treatment unless they become bothersome.

3. Moles (Nevi): Moles can vary in color, size, and shape. If you notice a new mole or a change in an existing mole, it is essential to monitor it for any changes. Moles can be benign, but some may develop into melanoma, a type of skin cancer.

4. Other Causes: In some cases, a black bump could be a sign of a more serious condition, such as a skin infection, cyst, or even a melanoma. If the bump is painful, itchy, or has changed in appearance, it is crucial to seek medical attention.

5. Skin Tags or Warts: These are also common skin growths that can appear in various areas, including the buttocks. Skin tags are usually flesh-colored or slightly darker, while warts can be rough and may have a darker appearance.

Given that you mentioned the bump does not hurt and has been present for some time, it is likely to be a benign condition. However, it is essential to keep an eye on it. If you notice any changes in size, color, or if it starts to itch or bleed, you should consult a healthcare professional for a proper evaluation.

When to Seek Medical Attention
- Change in Appearance: If the bump changes in size, shape, or color.

- Pain or Discomfort: If it becomes painful or tender to the touch.

- Bleeding or Oozing: If there is any discharge or bleeding from the bump.

- New Symptoms: If you develop new symptoms such as fever, chills, or other systemic signs of infection.

Conclusion
While a black bump on the buttocks is often benign, it is essential to monitor it closely. If you have any concerns or if the bump changes in any way, it is advisable to consult a dermatologist or healthcare provider. They can perform a thorough examination and, if necessary, conduct a biopsy to rule out any serious conditions. Remember, early detection and treatment are crucial for any skin-related issues.

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