The ultimate question of the Tita-in-training or anyone deep in the K-beauty rabbit hole. It's a phrase born from Filipino meme culture. You see a weird ingredient like 'snail mucin' or 'galactomyces'? You ask, "Skin care yarn?" to the group chat. It's a funny, slightly sarcastic way of saying, "Is this another one of those complicated things I need to put on my face to achieve 'glass skin'?" 'Yarn?' is the witty, beki-fied version of 'iyan ba?' (is that it?).