What is the Black Stone-Like Substance from My Mole? - Dermatology

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A mole expelled a hard black substance?


In the past few days, I noticed that a mole above my clavicle developed pus, and I squeezed out a small black object that looked like a stone.
After removing it, the wound turned into a small hole.
What could that black stone-like object be?

Ms. Lu, 10~19 year old female. Ask Date: 2016/04/30

Dr. Wu Yuxin reply Dermatology


Without actually seeing the lesion, it is impossible to make a definitive diagnosis.
If it is causing significant distress, please seek medical attention as soon as possible.

Reply Date: 2016/04/30

More Info


The appearance of a black stone-like substance from a mole, especially after it has become inflamed or developed pus, can be concerning. This situation may indicate several possibilities, and it is essential to approach it with caution and seek medical evaluation.

Firstly, the black substance you described could be a keratin plug. Moles, or nevi, can sometimes become inflamed or irritated, leading to the accumulation of keratin, which is a protein found in skin cells. When the mole is squeezed or manipulated, this keratin can be expelled, appearing as a small, dark, stone-like object. This is often benign and not a cause for alarm, but it is crucial to monitor the mole for any changes.

Another possibility is that the black substance could be a sign of a more serious condition, such as a melanoma or other skin cancer. Melanomas can sometimes bleed or ooze, and if they become necrotic (tissue death), they may produce dark, scab-like material. If the mole has changed in size, shape, color, or has become painful, it is vital to consult a dermatologist for a thorough examination. They may perform a biopsy to determine if the mole is cancerous.

Additionally, if the mole has been infected, the pus you mentioned could be a sign of an infection, which can occur if bacteria enter through a break in the skin. The presence of pus and the formation of a hole in the skin suggest that the area may require treatment to prevent further infection. In this case, a healthcare provider may prescribe antibiotics or recommend proper wound care.

It is also worth noting that if you have a history of skin conditions or if there are changes in your skin, it is always best to err on the side of caution. Regular skin checks and monitoring for any new or changing moles are essential parts of skin health, especially for individuals with a higher risk of skin cancer.

In summary, while the black stone-like substance could be a benign keratin plug, it is crucial to consider the context of the mole's changes and the presence of pus. I strongly recommend scheduling an appointment with a dermatologist as soon as possible. They can provide a definitive diagnosis and appropriate treatment, ensuring that any potential issues are addressed promptly. Remember, early detection is key in managing skin health effectively.

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