Purity: Wudu with Uncovered Wound or Fracture
Practical Laws of Islam as per the teachings of Ayatullah Sistani
Ruling 323:
If on one of the parts of the body on which wuḍūʾ is performed there is a wound, boil, or broken bone, in the event that it is uncovered and water is not harmful for the person, he must perform wuḍūʾ in the normal manner.
-Ayatullah Sistani, Practical Laws of Islam, Purification (Taharah)