How does one perform dry ablution (tayammum) if there is plaster on their hand? And what is the boundary of the face?

Question:
If there is plaster on one of my hands or both, or if there are wounds on them, how do I perform dry ablution (tayammum)? Is the boundary of the face in dry ablution the same as in ablution (wudu')?

Answer:
Yes, the boundary of the face in dry ablution is like that in ablution: one wipes the face from the top of the forehead to the beard and what is adjacent to the ears, the cheeks, with both hands. If there is plaster on a leg or on the hands, it is sufficient to wipe over the surface; one wipes with water, and there is no need for dust, because plaster is not harmed by water. So one wipes over the hands with water, and the face with dust if water would harm it. As for the hand covered by a splint or plaster, or the leg likewise, one wipes over it with water, because it is like a splint.
And if part of the leg is covered and part is exposed: the covered part is wiped over, and the exposed end is washed if washing is possible. If water would harm it, one performs dry ablution... there is no need for wiping in dry ablution; there is only the face and the palms.
The point is that if there is plaster on the leg and one is performing ablution, one wipes over the plaster and that is sufficient. But if water would harm it, dry ablution is for the face and the palms only.