Is It a Wart, Corn, or Lipoma? Your Foot Skin Concerns - Dermatology

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Unsure whether it is a wart, corn, or sebaceous cyst?


Hello Dr.
Wu: Today I discovered a black spot under the skin on the sole of my foot.
It feels a bit hard when pressed and has a slight pain.
When I squeezed it with my hand, it became somewhat raised and red, resembling a pimple, but shortly after, it returned to a smooth surface, although the black spot remained underneath the skin.
I'm uncertain about what this could be and I'm worried that if I go to a dermatologist, they might just suggest observation or make an incorrect diagnosis.
Previously, I had a black toenail that was diagnosed as a fungal infection, but later I realized it was just a bruise, so I'm hesitant to go to the clinic without being sure.
If it is a wart, I haven't been in public places without shoes for the past year or two, nor do I know anyone close to me who is undergoing treatment for warts.
However, I did have an experience a month ago where I bruised my toe from wearing pointed shoes, and it hasn't healed yet, which makes me question whether it is a wart, a corn, or a lipoma.
I understand that it's difficult for a doctor to make a definitive conclusion without seeing the skin, so I just wanted to ask if my current situation is suitable for observation or if I should promptly visit a dermatologist for a diagnosis.
Thank you!

Xiangrihui, 20~29 year old female. Ask Date: 2021/03/05

Dr. Wu Yuxin reply Dermatology


Actually, I'm still unclear about your question.
Without seeing the lesion in person, it's impossible to determine the issue.
If it's causing you significant distress, please seek medical attention as soon as possible.
A proper examination is necessary to understand the problem and to address it appropriately.

Reply Date: 2021/03/05

More Info


Based on your description, it sounds like you are experiencing a skin issue on your foot that has raised some concerns. The presence of a black dot under the skin, which is hard to the touch and causes slight pain, can indeed be perplexing. It is understandable to feel hesitant about seeking medical advice, especially given your previous experience with a misdiagnosis. However, it is crucial to address your concerns properly.

The symptoms you describe could potentially be attributed to several conditions, including warts, corns, or even a lipoma. Here’s a brief overview of each:
1. Warts: These are benign growths caused by the human papillomavirus (HPV). They can appear as rough, raised bumps and may have a black dot in the center, which is often a blood vessel. Warts can be painful, especially if they are located on weight-bearing areas of the foot.

2. Corns: These are thickened areas of skin that develop in response to pressure or friction. They often appear on the tops or sides of toes and can be painful when pressed. Corns typically do not have a black dot but may have a hard center.

3. Lipoma: This is a benign tumor made of fat tissue. Lipomas are usually soft and movable under the skin and are generally painless. They do not typically present with a black dot.

Given that your condition has persisted and changed (from a hard black dot to a raised red bump and then back to a smooth surface), it is advisable to seek a professional evaluation. While it is true that some skin conditions can be monitored, the fact that you are experiencing pain and changes in the appearance of the lesion warrants a visit to a dermatologist.

Here are a few reasons why you should consider seeing a dermatologist sooner rather than later:
- Accurate Diagnosis: A dermatologist can provide a thorough examination and may perform a biopsy if necessary to determine the exact nature of the lesion. This is crucial for appropriate treatment.

- Preventing Complications: If the lesion is indeed a wart or another condition that could worsen, early intervention can prevent further complications, such as infection or spreading.

- Peace of Mind: Getting a professional opinion can alleviate your concerns and help you understand what you are dealing with. This can reduce anxiety about the condition and its potential implications.

- Treatment Options: If it is a wart or another treatable condition, the dermatologist can offer various treatment options, including cryotherapy, topical treatments, or other methods to remove or manage the lesion effectively.

In conclusion, while it is understandable to feel apprehensive about seeking medical advice, it is essential to prioritize your health. Given the symptoms you described, I recommend scheduling an appointment with a dermatologist for a comprehensive evaluation. Early diagnosis and treatment can make a significant difference in managing your foot condition effectively.

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