指甲颜色变黄指甲颜色变黄在老年人最常见,这是机体自然衰老的表现。除此以外,甲真菌病(俗称的灰指甲)、银屑病等疾病时指甲也可以变黄。如果指甲颜色变黄且伴有甲板增厚、松脆、甲下碎屑等情况,很有可能是得了“灰指甲”。这时到医院做个真菌化验检查,常常会是阳性。而银屑病患者的指甲虽然也会变黄,但是通常会见到针尖大小的凹坑,真菌化验检查为阴性。指甲颜色变红甲床呈暗红色,常见于红细胞增多症。樱桃红色甲床,见于一氧化碳中毒。局限性蓝红色斑,有压痛的,可能是甲下血管球瘤。指甲颜色变蓝临床上称为蓝甲。蓝甲常见于心肺功能不全,所有甲床和甲半月呈紫绀色。服用某些药物也可引起蓝甲。指甲颜色变绿临床上绿色条纹甲,可见于缺铁性贫血患者,甲板出现绿色条纹状纹理,可伴有反甲、灰甲。
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