Tā zuìjìn tuōfà yánzhòng, juédìng qù kàn pífūkē yīshēng.
He has been losing a lot of hair recently and decided to see a dermatologist.
Tips
usage
脱发 can be a noun (hair loss as a condition) or used verbally (to lose hair). Common collocations: 脱发严重 (severe hair loss), 防止脱发 (prevent hair loss). Note the traditional form has 髮 (hair on the head) not 發.