The weather is dry and the corners of his mouth have cracked.
Tips
mistakes
Same two characters as 口角, a quarrel, but that word reads 角. For the corner of the mouth the reading is jiǎo, the ordinary corner or angle sense of the character.
usage
This is the written and medical word. Everyday speech uses 嘴角 for the same spot, while 口角 turns up in descriptive writing and in clinical terms such as 口角炎, angular cheilitis.