I have selected the right biceps and the weight paint is only there.
But if I select the right Middle1 finger, I see changes in the weight paint on both arms. So when I try to move the right arm it will also move some part of the left arm. I am new to blender and rigging. I tried going in Weight Paint mode and erase from the other arm but It did not work. But if I erase from the right Middle finger it will erase on the other arm.
What can I do?
[SOLUTION] I had, for my arms the mirror modifier unapplied. When I applied it, I could edit the other hand too.