Skin Bumps: What Could That Round Growth Be?

Skin lesions or skin growths?

A few months ago, I noticed a round bump on my buttocks (it's not very clear since I assessed it through touch and by looking in the mirror).
At first, I didn't think much of it, assuming it might go away on its own.
However, I recently realized that it is still there, and I'm a bit concerned.
The bump is approximately the size that can be covered by the tip of my index finger, and when I press on it, it feels hard inside (similar to pressing on a closed pimple).
It doesn't hurt when I press it, and I don't feel anything unusual otherwise.
It appears to have a darker color through the skin, and the surface does not have any openings.
Based on my first impression when I discovered it, it seems to have not grown larger.
I would like to know what this could possibly be and if it requires any treatment (especially since I prefer not to go to the hospital due to the recent pandemic).
Also, does sitting on a hard chair or floor and pressing against it have any implications?

Niming, 10~19 year old female. Ask Date: 2021/07/25

Dr. Wu Yuxin reply Dermatology

If no lesions are observed and it is difficult to determine or suspect what the issue may be, please seek medical attention promptly if it is causing significant concern.

Reply Date: 2021/07/25

More Info

Based on your description of a round, firm bump on your skin, there are several possibilities for what this growth could be. The characteristics you mentioned—such as its size, firmness, lack of pain upon pressure, and the fact that it has not changed significantly over time—are important clues in determining its nature.

One common type of skin bump that fits your description is a sebaceous cyst. These cysts are usually benign and occur when a hair follicle becomes blocked, leading to the accumulation of keratin and sebum. They can feel firm to the touch and may appear as a round, smooth bump beneath the skin. Sebaceous cysts are generally not painful unless they become infected.
Another possibility is a lipoma, which is a benign tumor made up of fatty tissue. Lipomas are typically soft, movable, and painless, and they can vary in size. They usually grow slowly and do not cause any symptoms unless they press on nearby structures.

A dermatofibroma is another type of benign growth that can appear on the skin. These are firm, raised bumps that may be brownish in color and can feel like a small nodule. They are often harmless and do not require treatment unless they become bothersome.

Given that the bump has not changed in size or caused any pain, it is likely benign. However, it is essential to monitor it for any changes, such as an increase in size, changes in color, or the development of pain. If you notice any of these changes, it would be advisable to seek medical attention.

Regarding your concern about sitting on hard surfaces, it is generally unlikely that this would affect the bump unless you experience discomfort or pain when sitting. If the bump is indeed a cyst or lipoma, it should not be impacted by pressure from sitting. However, if you notice any discomfort or changes in the bump after sitting, it would be worth discussing with a healthcare provider.

In light of the ongoing pandemic, it is understandable to be cautious about visiting healthcare facilities. However, if the bump changes or if you develop any new symptoms, it is essential to consult a healthcare professional. Many clinics offer telehealth services, which can provide an opportunity to discuss your concerns without needing to visit in person.

In summary, while the bump you described is likely benign, it is crucial to keep an eye on it and consult a healthcare provider if you notice any changes or if you have concerns about it. Regular self-examinations of your skin can help you catch any changes early, and maintaining open communication with your healthcare provider is vital for your overall health and peace of mind.

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