How does a person in a state of major ritual impurity who has a wound affected by water perform ritual purification?

Question:
A person was injured, and a bandage was wrapped around the wound. He experienced a wet dream, and the doctor ordered him to keep water away from the entire wound. What is the ruling in his case?

Answer:
If a person experiences a wet dream, or has intercourse with his wife, and he has a wound with a cast on it, he washes the rest of his body and wipes over the cast. He washes the rest of his body to remove the major ritual impurity, and for the cast with the bandage on it, he wipes over the bandage with a light wipe, so that water does not reach the wound. He should be careful and wipe over the bandage.
If there is something on the wound, or if the bandage is weak and water reaching it would harm the wound, he performs dry ablution with clean earth after he finishes the full ritual bath and it dries. He strikes his face with his hands and wipes his face and his palms with the intention of covering the location of the wound. However, if there is a bandage or a tied cast on the wound, he wipes over it, and that is sufficient, and praise be to Allah.
Likewise, if a person has a plaster on his side, or on his back, or on his stomach due to an illness, and he becomes in a state of major ritual impurity, it is sufficient for water to pass over it when it passes over it; that is enough.

Question: He does not perform dry ablution with clean earth.?

Answer: He does not perform dry ablution with clean earth; he does not need to perform dry ablution with clean earth; he does not need it; water is sufficient.