Key Point Summary
爪は血腫などが原因でとなって剥離(=爪甲剥離)すると、その下から新しい爪が生えてくる。
手指の爪は生え代わるのに半年、足趾の爪は生え代わるのに1年かかる。
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Q & A
■ 爪が生え代わる経過
- 爪甲剥離して1〜2ヶ月すると、手前から新しい爪が生えてきて二重爪(新しい爪が下、古い爪が上)になる可能性が高いこと、完全に爪が生えかわるのに約半年かかることを説明しておくとよい。
- 手指の爪は、成人で1日0.1mm伸び、約半年で全体が生えかわる。
- 足趾の爪は、成人で1日0.05mm(手指の爪の生えるスピードの半分)伸び、約1年で全体が生えかわる。
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