The word 脓疱 (nóngpào), meaning "pustule", is formed by combining the character 脓, meaning "pus", which consists of the radical 月 (indicating relation to flesh or the body) and the phonetic component 农 (suggesting pronunciation), with the character 疱, meaning "blister", which consists of the radical 疒 (indicating illness) and the phonetic component 包 (suggesting pronunciation); together, 脓 modifies 疱 to specify a pus-filled blister.