《世界一受けたい授業》皮膚や毛穴に潜む顔ダニ（デモデクス）！日本人がほぼ全員持つダニの引き起こすと害（肌トラブル）とは？
※世界一受けたい授業 2013年9月7日放送分より
様々なダニを研究している、
ダニのスペシャリスト五箇公一先生が
ダニの知識を分かり易く解説する。
皮膚や毛穴に潜み、
皮脂を食べるダニがいる！？
五箇公一先生は、
顔や頭に住んでいるかも知れないダニを紹介。
人の皮膚や毛穴についている皮脂という脂を、
食べて食べているダニが実はいて、
しかもこれが日本人の場合、
98%位の人が実は持っているという。
つまりこのダニは普通にいる普通種とも呼べるダニなのである。
頭皮に約15万匹生息する顔ダニ（デモデクス）！
顔や頭皮に生息するこのダニは、
通称顔ダニと呼ばれ、
正式名称はデモデクスという。
体長は0.1mm～0.4mmであり、
1つの毛穴につき、
1～3匹程度生息しているという。
一般的に頭皮に毛穴は5万あると言われるので、
頭皮だけでも約15万匹も生息している可能性がある。
産まれたばかりの赤ちゃんには顔ダニはいないが、
親が抱いたり、
頬ずりした時に感染すると言われている。
顔ダニ（デモデクス）による害とは？
増え過ぎは肌トラブルの原因に！
五箇公一先生によると、
顔ダニ（デモデクス）は普段は、
なんともなく害はないという。
しかし体調悪くしたり、肌の具合が良くない、
といった時に顔ダニが増え過ぎることがある。
顔ダニ（デモデクス）が増えすぎてしまうと、
にきびや、吹き出物の原因になってしまうという。
顔ダニ（デモデクス）による、
肌トラブルを防ぐ方法とは？
五箇公一先生は、
顔ダニ（デモデクス）による、
上記のような肌トラブルを防ぐ方法（予防法）についても言及。
通常通り、顔をきちんと洗って、
清潔にしていれば何の問題もないという。
また健康状態に気を配る必要があり、
常に生活習慣を整えて、
清潔に生活することが基本となるという。
そして何よりも大事なのは、
このダニは普通にいるダニなので、
昔から我々はこのダニとくっついて、
生活してきている。
だから、
逆にそれをゼロにするということは、
かえって良くないことが起こるかもしれない、
と説明された。
《もうちょっと調べてみた&所感》
一昔前に結構この顔ダニの存在は、
世間を賑わせたので、
ご存知の方も多いかと思います。
wikipediaにはニキビダニという名称で、
掲載されているようなので、
より詳しい事を知りたい方は、
そちらを参照してみて下さい。
そして五箇先生も番組で触れてらっしゃいましたが、
この顔ダニは常在菌のように、
最早人間にとっていて当たり前の存在です。
ですから一説によると、
この顔ダニがいなくなると、
皮脂を食べてくれる存在がいなくなるので、
皮脂の過剰分泌により、
肌トラブルを引き起こすと言われております。
まとめると、
何事もそうですが、
増えすぎても減りすぎても、
顔ダニは肌トラブルの元になるということですね。
ですから特に対策を講じる必要はありませんし、
こんな存在もいるんだ程度に抑えておけばよいでしょう。
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