黑色素瘤开始时呈现色素痣或雀斑的外观，但颜色、大小和形状上有区别，是皮肤肿瘤中最危险的一类。

Melanomas appear as a mole or freckle that changes colour, size or shape, but are the most dangerous type of skin cancer.

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黑色素瘤开始时呈现色素痣或雀斑的外观，但颜色、大小和形状上有区别，是皮肤肿瘤中最危险的一类。

Melanomas appear as a mole or freckle that changes colour, size or shape, but are the most dangerous type of skin cancer.

youdao