例１：男，６８岁。该患者自出生时右颊部有一米粒大小“黑痣”，扁平。近１０年来缓慢增大，近２年明显增大到指甲大小。并在“黑痣”中心出现一黄豆大高起硬结，轻度刺痒。６月前皮损自行破溃伴少量流血，１周后溃烂面愈合。入院前４ｄ皮损再次破溃，流血，微感刺痛。查... Example 1: Male, 68 years old. The patient had a grain size “black pimple” in the right cheek from birth and was flat. Slowly increased in the past 10 years, significantly increased to nail size in the past 2 years. At the center of the “Black Skull”, a large soy bean sprouted and hardened, and it was slightly itchy. Before 6 months, the skin lesions broke with a small amount of bleeding, and the ulcerated surface healed after 1 week. 4 days before admission, skin lesions broke again, bleeding, and tingling. check...