Wu Collection, Middle Volume Radical: Sickness (bìng) Character: Fei Kangxi strokes: 10 Page 771, Entry 34 Guangyun (Rhyme Dictionary): Pronounced fei (falling tone). Jiyun (Collective Rhymes): Pronounced fei (falling tone). Pronounced fei (falling tone). Yupian (Jade Chapters): A small sore caused by heat. Jiyun (Collective Rhymes): A heat-induced ulcer. Huangdi Suwen (Yellow Emperor's Inner Canon): If one encounters moisture while sweating, acne and heat rashes will develop. Zhengzitong (Correction of Character Dictionary): Common parlance today for skin rashes caused by heat that bubble up like boiling water is called fei-zi.