名词
中文翻译：黑头
同义词：
['nigma', 'nevus', 'mole']
例句：
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1.The dark spot on his face is a petaum nigrum.
他脸上的小黑点是一个黑痣。
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2. She carefully removed the petaum nigrum from her arm.
她小心翼翼地从手臂上拔下了黑痣。
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3.He had a petaum nigrum on his left cheek that he was trying to get rid of.
他的左脸颊上有一颗黑痣，他正试图去掉它。