Malignant change is rare with these lesions.

这些病变很少发生恶变。

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The change that causes malignant melanoma is the first one they have found.

他们首先发现的是导致恶性黑素瘤的突变。

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The change that causes malignant melanoma is the first one they have found.

他们首先发现的是导致恶性黑素瘤的突变。

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