wen
a lump (= raised part) that has grown on the skin
皮质囊肿，表皮囊肿，粉瘤
He had a strange wen on his face, below the right side of his mouth.
他的脸上长了一个奇怪的粉瘤，在嘴的右下角。
根据本柯南看
剑桥字典的解释
wen是粉瘤
所以有谁绰号是粉瘤
或是有长粉瘤的人
就是嫌疑犯