melanomas
n.
（恶性）黑素瘤，（良性）胎记瘤( melanoma的名词复数 );
例句:
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Other types, such as adenocarcinomas, lymphomas and melanomas, may also occur.
来自BBC
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How do you think I got all these melanomas in the first place ?
不然你们认为我这黑素瘤是如何得来的 呢 ?
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Irregularly shaped brown or blue spots in the nail bed can be melanomas.
甲床上不规则的棕色或蓝色点可能是黑索瘤.