Common on Weibo and Xiaohongshu: 素颜自拍 (no-makeup selfie), 素颜出镜 (appearing on camera without makeup). Related: 素颜霜 (tone-up cream, a light complexion cream marketed as 'looks-like-no-makeup').
memory
素 carries the idea of 'plain, unadorned' (as in 素食 vegetarian food), 颜 = face/complexion. 'Plain face'.
