huà / pí / bǐ / yù / wài / biǎo / měi / lì / ér / nèi / xīn / xiǎn / è / de / rén / hé / shì / 。

画皮比喻外表美丽而内心险恶的人和事。

Painted skin figuratively refers to people or things that appear beautiful on the outside but are sinister within.