Nevi: When to Worry About Potential Skin Cancer - Dermatology

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When it comes to skin lesions, particularly nevi (commonly known as moles), it is crucial to understand the characteristics that may indicate a potential risk for skin cancer, specifically melanoma. Your concern regarding a nevus located near your clavicle that measures approximately 1 cm in length and exceeds 6 mm in diameter is valid, as size is one of the key factors in assessing the risk of malignancy.

The ABCDE rule is a widely accepted guideline used to evaluate moles for signs of melanoma:
1. Asymmetry: If you draw a line through the mole, the two halves do not match in shape.

2. Border: Melanomas often have irregular, scalloped, or poorly defined edges.

3. Color: A variety of colors (brown, black, tan, red, white, or blue) within a single mole can be a warning sign.

4. Diameter: While most melanomas are larger than 6 mm (about the size of a pencil eraser), they can also be smaller when diagnosed.

5. Evolving: Any change in size, shape, color, or elevation, or any new symptom such as bleeding, itching, or crusting, is a cause for concern.

Given that your nevus exceeds 6 mm in diameter and has been present since childhood, it is advisable to monitor it closely. While many nevi are benign and do not pose a risk, any changes in their appearance or size warrant further evaluation by a healthcare professional.
In your case, the fact that the nevus is larger than 6 mm and has been a point of concern for you suggests that it would be prudent to seek a consultation with a dermatologist. A dermatologist can perform a thorough examination and may recommend a biopsy if there are any suspicious features. A biopsy involves removing a small sample of the mole for laboratory analysis to determine if it is benign or malignant.

It is important to note that while the majority of nevi are harmless, melanoma is a serious form of skin cancer that can spread to other parts of the body if not detected early. Early detection significantly improves treatment outcomes and survival rates. Therefore, if you notice any changes in your nevus or if it fits the criteria outlined in the ABCDE rule, do not hesitate to seek medical advice.

In summary, while not all nevi that exceed 6 mm are malignant, your nevus's size and your concerns about it are valid reasons to consult a dermatologist. They can provide a professional assessment and determine whether any further action is necessary. Regular skin checks and being vigilant about changes in your skin are essential components of skin cancer prevention and early detection.