Melanin Deposits: When to Worry About New Moles

Melanin deposition

Hello, my skin tone is classified as dark.
I usually do not pay much attention to sun protection.
Recently, I noticed two or three new moles appearing on my arms and calves.
Initially, they were faint, but they have become more pronounced over time, with some being a darker brown color.
I'm unsure if this is normal melanin deposition or if it indicates a pathological change.

Alice, 20~29 year old female. Ask Date: 2007/05/09

Dr. Huang Ruiyun reply Dermatology

It is likely just a common mole.
If you are concerned, please see a dermatologist in person.

Reply Date: 2007/05/09

More Info

When it comes to understanding melanin deposits and the appearance of new moles, it's essential to approach the topic with a combination of knowledge about skin health and awareness of potential warning signs. Melanin is the pigment responsible for the color of our skin, hair, and eyes, and it plays a crucial role in protecting our skin from the harmful effects of ultraviolet (UV) radiation. However, the development of new moles or changes in existing moles can sometimes be a cause for concern.

Firstly, it’s important to note that the appearance of new moles, especially in individuals with darker skin tones, can be relatively common. Many people develop new moles throughout their lives, particularly during childhood and adolescence. However, the characteristics of these moles can provide valuable information about whether they are benign or potentially harmful.

The ABCDE rule is a helpful guideline for evaluating moles:
1. Asymmetry: If you draw a line through the middle of the mole, the two halves should match. If they don't, this could be a warning sign.

2. Border: Look for irregular, scalloped, or poorly defined edges. Moles with smooth, even borders are typically less concerning.

3. Color: A mole that has multiple colors (brown, black, tan, red, white, or blue) or is unevenly colored may be a cause for concern.

4. Diameter: Moles larger than 6mm (about the size of a pencil eraser) should be evaluated by a healthcare professional.

5. Evolving: Any mole that changes in size, shape, color, or elevation, or that develops new symptoms such as bleeding, itching, or crusting, should be examined.

In your case, since you have noticed new moles that have become more pronounced and have varying shades of brown, it is advisable to monitor these changes closely. While it is possible that these moles are benign, especially if they have developed gradually and do not exhibit any concerning characteristics, it is always better to err on the side of caution.

If you notice any of the following changes in your moles, it is important to consult a dermatologist:
- Any mole that becomes asymmetrical or has irregular borders.

- Changes in color, particularly if the mole becomes darker or develops multiple colors.

- An increase in size or diameter.

- Any new symptoms such as itching, bleeding, or crusting.

Additionally, individuals with darker skin tones may be at a lower risk for melanoma compared to those with lighter skin, but they are not immune to skin cancer. Therefore, regular skin checks and sun protection are crucial, regardless of skin type. It is advisable to incorporate sun protection measures, such as wearing sunscreen with a high SPF, seeking shade, and wearing protective clothing, especially if you have not been diligent about sun exposure in the past.

In summary, while the appearance of new moles can be a normal part of skin changes, it is essential to monitor them for any concerning signs. If you have any doubts or if the moles exhibit any of the ABCDE characteristics, it is best to seek a professional evaluation. Regular skin checks by a dermatologist can help ensure that any potential issues are identified early, allowing for timely intervention if necessary.

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