One was a 69-year-old man presented with a solitary dark papular lesion on the right shoulder for 10 years.

• 均为老年患者,分别因右肩部黑褐色丘疹10年余及左大腿内侧淡褐色斑50年,增大、颜色加深伴瘙痒1个月就诊,皮疹均为单发。