Question

An allogenic skin graft allows a person with a burn to receive skin from a donor patients are often given drugs that suppress the immune system why would a
patient need to be given these drugs

Answer 1

Most likely because the new skin from the skin graft is considered foreign and the body's initial response is to fight off foreign bodies. But the patient wants their body to accept the new skin so they take drugs to suppress the immune system's innate response to reject the skin.