身体的外露部分,以及乳头、腋窝、生殖器官、关节、肛门周围等皮肤色素加深,口腔粘膜色素沉着,常见于下列哪种疾病( )
A campus emergency ______ occur at any time of the day or night, weekend, or holiday, with little or no warning.
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