铅笔戳伤１２年致恶性黑色素瘤１例报告患者杨××，女，２５岁，住院号１７１１。１２年前右下唇被铅笔尖戳破，几天后该处留下一小灰黑色斑点。近１年来，该斑点颜色加深，逐渐扩大，且凸出于粘膜，患者常用针尖挑破，以图去除，但没能成功。当地行局部切除，但很快复发... Penciling 12 years of malignant melanoma caused by a case report Yang × ×, female, 25 years old, hospital number 1711. 12 years ago the lower right lip was punctured pencil tip, a few days later left a small gray-black spots . In the past year, the spot color deepened, gradually expanded, and protruding from the mucosa, the patient commonly used needle tip to break, in order to remove, but failed to succeed. Local local excision, but soon relapse ...