Purity: Uncovered Wounds and Fractures When Water is Harmful

Practical Laws of Islam as per the teachings of Ayatullah Sistani

Ruling 324:

If a wound, boil, or broken bone is on one’s face or arms, and it is uncovered, and pouring water over it is harmful, then the area around the wound or boil must be washed from top to bottom in the manner that was explained regarding wuḍūʾ. If drawing a wet hand over it is not harmful, it is better that one draw a wet hand over it, place a pure cloth over it, and then draw a wet hand over the cloth as well. As for the case of a broken bone, it is necessary to perform tayammum [instead of jabīrah wuḍūʾ].

-Ayatullah Sistani, Practical Laws of Islam, Purification (Taharah)