Moles: When to Worry About Skin Cancer Risks

Having too many moles raises concerns about skin cancer?

Doctor, may I ask if having more than 7 moles on the right arm means that the total number of moles on the entire body exceeds 50? And if there are more than 11 moles on the right arm, does that mean the total number of moles on the entire body exceeds 100? Also, what is the normal number of moles for a person? Recently, I discovered two small moles on my right arm, each less than 0.1 cm, in addition to five small moles that I had previously.
After reading many articles, I found a study from the UK stating that if there are more than 7 moles on the right arm, the total number of moles on the body exceeds 50, and if there are more than 11 moles, the total exceeds 100.
After seeing this article, I am unsure of its validity or relevance.
I carefully counted my moles and found about 25 moles and a dozen dark spots that I can't determine if they are moles or acne scars.
I am very worried about the increased risk of melanoma, basal cell carcinoma, or squamous cell carcinoma.
I hope no more moles appear on my right arm, as I feel anxious all day when a new one develops.
Additionally, I cannot distinguish whether the dark spots on my skin are moles or acne scars.
When I ask my parents, they say I am being neurotic.
I am currently very anxious and don't have many methods to observe where new moles might appear on my body, aside from looking in the mirror or taking photos.
Are there any other methods for self-examination? Furthermore, if I have moles removed, will that affect my risk of developing skin cancer? I also want to ask if skin cancer cells can spread through the lymphatic system to other organs such as the liver, lungs, pancreas, or stomach.
Is the likelihood of cancer cell metastasis significant? And is it possible for someone with stage III or IV skin cancer to not show any signs of cancer cell metastasis?

mm, 20~29 year old female. Ask Date: 2020/08/22

Dr. Wu Yuxin reply Dermatology

It's not the number of moles that increases the risk of skin cancer; rather, it's important to observe each mole individually.

Reply Date: 2020/08/22

More Info

When it comes to understanding moles and their potential link to skin cancer, it’s essential to recognize that while having a certain number of moles can be a risk factor, it is not the only determinant of skin cancer risk. The presence of multiple moles, particularly atypical or dysplastic moles, can increase the likelihood of developing melanoma, a serious form of skin cancer.
To address your specific concerns, having more than 50 moles on your body is not uncommon, especially for individuals with lighter skin tones or those who have a family history of moles or skin cancer. The numbers you mentioned regarding the correlation between the number of moles on your right arm and the total number of moles on your body are based on statistical studies, but individual experiences can vary greatly. It’s important to remember that while these studies provide useful guidelines, they are not definitive for every individual.

In general, the average person can have anywhere from 10 to 40 moles, but some people may have many more. The key is to monitor these moles for any changes in size, shape, color, or texture, which can be indicative of potential malignancy. The ABCDE rule is a helpful guideline for evaluating moles:
- Asymmetry: One half of the mole does not match the other.

- Border: The edges are irregular, ragged, or blurred.

- Color: The color is not uniform and may include shades of brown, black, or even red, white, or blue.

- Diameter: The mole is larger than 6mm (about the size of a pencil eraser).

- Evolving: The mole is changing in size, shape, or color.

For self-examination, aside from using mirrors or taking photos, you can ask a trusted friend or family member to help check areas that are hard to see, such as your back. Regular dermatological check-ups are also crucial, especially if you have a family history of skin cancer or if you notice any changes in your moles.

Regarding your concern about the removal of moles, having moles removed does not inherently increase or decrease your risk of skin cancer. However, if a mole is found to be atypical or cancerous upon removal, it is crucial to have it examined by a pathologist to determine if further treatment is necessary.

As for the spread of skin cancer, melanoma can indeed metastasize through the lymphatic system to other organs such as the liver, lungs, pancreas, and stomach. The likelihood of metastasis depends on various factors, including the thickness of the melanoma at the time of diagnosis, the presence of ulceration, and whether the cancer has spread to nearby lymph nodes. Some individuals may be diagnosed with advanced stages of melanoma without showing obvious signs of metastasis, which underscores the importance of early detection and regular skin examinations.

If you are feeling anxious about your moles or any changes in your skin, it is advisable to consult with a dermatologist. They can provide a thorough examination and, if necessary, perform a biopsy to rule out any malignancies. Early detection is key in managing skin cancer effectively, so don’t hesitate to seek professional advice.

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