例1:患者王×,男,16岁,1972年3月5日,因右上牙痛,曾在某医院诊断为6牙周炎而拔除。3天后,右侧眶下、颊、上唇出现弥漫性肿胀,同侧三叉神经第2支分布区皮肤有成群粟粒绿豆大小的小水疱、周围红晕,排成带状、部分自溃、糜烂、同侧颊粘膜、 Example 1: Patient Wang ×, male, 16 years old, March 5, 1972, was diagnosed with 6 periodontitis by a right upper-toothache and was removed at a hospital. 3 days later, the right infraorbital, buccal and upper lip appeared diffuse swelling, ipsilateral trigeminal nerve distribution of the second branch of the skin with clusters of miliary miliary size small blisters around the flush, lined, part of the ulceration, erosion, Ipsilateral buccal mucosa,