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Guilherme Mazui

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What is the Difference Between Melanoma and Nevus?

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Melanoma and nevus (also known as a mole) are both skin growths, but they have some key differences. Melanoma is a type of skin cancer that can be life-threatening, while a nevus is a benign (non-cancerous) skin growth made up of melanocytes, which produce pigment in the skin. Some differences between melanoma and nevus include:

  • Border: The border of a nevus is usually smooth and regular, while melanomas may have an irregular or poorly defined border that blends into the surrounding skin.
  • Color: A nevus usually has a consistent color throughout, while melanomas can have uneven color distribution, with shades of black, brown, and tan present.
  • Size: Melanomas can grow larger than a regular mole, and changes in size can be a warning sign of melanoma.
  • Shape: A nevus typically has an oval or round shape, while melanomas can have an irregular shape.
  • Evolution: Melanomas may evolve or change in appearance over time, while nevi usually do not change.

It is essential to perform regular self-screenings for skin cancer and use the ABCDE rule to assess each mole or spot for potential signs of melanoma. The ABCDE rule stands for:

  • Asymmetry: The shape of one half does not match the other half.
  • Border that is irregular: The edges are often ragged, notched, or blurred in outline.
  • Color that is uneven: Shades of black, brown, and tan may be present.
  • Diameter: Melanomas are usually larger than 6 mm (the size of a pencil eraser).
  • Evolution: Changes in size, shape, color, or symptoms like bleeding, itching, or crusting.

If you notice any changes in a mole or spot on your skin, it is crucial to consult a doctor or dermatologist for evaluation, as these changes could be a warning sign of melanoma.

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  • What is the Difference Between Melanoma and Nevus?
  • Comparative Table: Melanoma vs Nevus

    • Comparative Table: Melanoma vs Nevus

    Melanoma and nevus are both related to pigmented skin lesions, but they have distinct characteristics and implications for health. Here is a table summarizing the differences between them:

    Feature Melanoma Nevus
    Definition Melanoma is a malignant, melanocytic tumor. Nevus is a benign collection of pigment-producing cells in the epidermis or dermis.
    Origin 70%-80% of melanomas arise de novo, without any associated nevus. Nevi are benign lesions that can be present from birth or develop later in life.
    Development Melanomas may develop in association with any nevus, but most melanomas, 70%-80%, develop de novo. Nevi represent an intermediate step for certain melanoma subtypes.
    Risk Melanoma is a form of skin cancer with the potential to spread to other parts of the body. Nevi are generally harmless and do not require removal, as very few dysplastic nevi or common moles turn into melanoma.

    It is essential to monitor and examine any changing or suspicious skin lesions, as early detection of melanoma significantly improves the chances of survival.

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    Guilherme Mazui

    Guilherme Mazui is graduated in journalism from the Federal University of Minas Gerais (UFMG) and a master's degree in Communication from the University of São Paulo (USP). In addition, he has experience in advertising writing and has worked as a content editor in several companies.