Moles: When to Observe and When to Seek Dermatological Advice

Issues related to moles?

Hello, doctor.
Previously, I visited a dermatologist because I noticed a black spot on the sole of my foot.
Recently, while wearing shorts, I discovered a round, flat black mole next to my knee, but I'm not sure if it has been there for a long time; I only noticed it recently during self-examination.
It's about 0.1 centimeters in size.
I would like to ask if it's generally okay to just observe it myself, or should I get it checked every time I find a new spot? During my previous two visits, the doctor used a device to examine it and advised me to just monitor it for now.

Additionally, last time I had a small black line at the tip of my thumb nail, and the doctor also used a light to check it and said it was a blood vessel and not a mole, so I shouldn't worry.
However, I forgot to ask how long it would take to disappear.
I would like to know if there are blood vessels inside the nails and how long such symptoms typically last before resolving.

Cheng, 20~29 year old female. Ask Date: 2020/03/12

Dr. Wu Yuxin reply Dermatology

Generally, observation is sufficient.
Blood vessels in the nails? Without seeing a lesion, it is difficult to determine the issue.
If it is very bothersome, please seek medical attention promptly.

Reply Date: 2020/03/12

More Info

When it comes to understanding moles and skin lesions, it's essential to know when to observe them and when to seek dermatological advice. Moles, or nevi, are common skin growths that can vary in color, size, and shape. While most moles are benign, some can develop into melanoma, a serious form of skin cancer. Therefore, being vigilant about changes in your skin is crucial.

In your case, you mentioned discovering a round, flat black mole near your knee, measuring about 0.1 cm. Since you have previously had a black spot on the sole of your foot that prompted a visit to a dermatologist, it’s understandable that you are concerned about this new finding. Generally, the recommendation is to monitor moles using the "ABCDE" rule, which stands for Asymmetry, Border irregularity, Color variation, Diameter greater than 6mm, and Evolving changes. If your mole exhibits any of these characteristics, or if you notice any changes in size, shape, or color, it is advisable to seek a dermatologist's opinion.

If your previous visits resulted in the dermatologist suggesting observation, it may indicate that the moles you presented were not concerning at that time. However, it’s important to maintain regular self-examinations of your skin, especially if you notice new moles or changes in existing ones. If you find yourself frequently discovering new moles or if you have a family history of skin cancer, it may be wise to schedule more frequent dermatological evaluations.

Regarding the small black line you observed at the tip of your thumb nail, this could be a benign condition known as a splinter hemorrhage, which occurs when small blood vessels under the nail break. It is common for nails to have blood vessels, and sometimes these can become visible due to trauma or other benign causes. If a dermatologist has assessed it and deemed it non-concerning, it is likely that it will resolve on its own. Typically, splinter hemorrhages can take several weeks to months to disappear, depending on nail growth rates and the extent of the injury.

In summary, while self-monitoring is essential, it is equally important to consult a dermatologist if you have any doubts or if you notice changes that fit the ABCDE criteria. Regular skin checks, especially if you have a history of skin issues or family history of skin cancer, can help catch potential problems early. Always prioritize your health and don't hesitate to seek professional advice when in doubt.

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