What does the idiom skin is like solidified fat mean?

Hello everyone! The idiom I want to explain to you today is that skin is like solidified fat;

Coagulation is often used to describe the skin or utensils as white and soft, which means that the skin is like coagulated oil and describes the skin as white and delicate. From The Book of Songs Feng Wei Shuo Ren: "Soft hands, skin like coagulation, collar like flies, teeth like rhinoceros, nodding your head, smiling.

Skin is generally used as a predicate and attribute, and is often used to describe women. Cai Dongfan wrote in the sixty-first chapter of The Romance of the Pre-Han Dynasty: "Looking at her under the lamp is more charming, but when looking at her, her eyebrows are like distant mountains, her face is like lotus flowers, and her skin is like jelly." Its synonym is "skin smiles but meat doesn't smile", so how should we make sentences with this idiom? Yang Yuhuan, one of the four beauties, has eyebrows like stars. If her skin is frozen, the expression of pear flower with rain highlights her unique charm.