Are wudoo’ and ghusl valid when there is dried blood on a wound?

Praise
be to Allah

What appears to
be the case is that this layer of blood that forms over the wound comes
under the same ruling as skin, because it is attached to the body, and
removing it is harmful.

So it is
sufficient to wash its outer surface, and you do not have to remove it.

An-Nawawi (may
Allah have mercy on him) said in al-Majmoo‘ (2/232):

Abu’l-Layth al-Hanafi
said in his Nawaazil: If someone has an ulcer and it becomes raised,
and its surface becomes raised, and the edges of the ulcer are attached to
the skin, except the part from which pus comes out, so it is raised and the
water cannot reach what is beneath its outer layer, then his wudoo’ is
valid. End quote.

In Haashiyat
al-Bujayrami ‘ala al-Khateeb (1/128), it says: al-Qaffaal said:
Accumulation of dirt on a part of the body does not cancel out the validity
of wudoo’ and it does not have to be removed if it has become a part of the
body, because it is not possible to separate it from it. What is meant by
its having become like a part of the body is if it cannot be distinguished
from the body in the eye of the beholder. End quote.

If the dirt has
become attached to the body to the extent that it has become a part of it,
it does not have to be removed, so it is more appropriate that the layer
covering a wound should not be removed than in the case of dirt.

For more
information, please see the answers to questions no.
227587 and 223833.

And Allah knows
best.