Final answer:
Desquamation of skin observed post bone marrow transplant is indicative of graft-versus-host disease (GVHD), which manifests when donor T cells attack the recipient's tissues.
Step-by-step explanation:
The nurse should recognize peeling of the skin on the hands and feet, or desquamation, as an indication of graft-versus-host disease (GVHD). This condition is a common complication after a bone marrow transplant when the donor immune cells, particularly the T cells present in the transplanted bone marrow, recognize the recipient's tissues as foreign and initiate an immune attack. GVHD can manifest with various symptoms, a skin rash being one of the acute signs, and may progress to affect other organs such as the liver and gastrointestinal tract if not treated effectively.