What discoid lupus did to Michael's nose and lips:
Lupus is a chronic, autoimmune disease that can damage any part of the body (skin, joints and/or organs inside the body). Normally our immune system produces proteins called antibodies that protect the body from foreign substances, like bacteria and viruses. With lupus, your immune system cannot tell the difference between these foreign invaders and your body's healthy tissues and creates autoantibodies ("auto" means "self") to attack and destroy healthy tissue. These autoantibodies cause inflammation, pain, and damage in various parts of the body.
I'm 100% sure most of the surgeries on his nose and/or lips were reconstructive since lupus attacked and destroyed those tissues which it isn't the same than plastic surgery. Michael would not say he had more reconstructive surgeries since he never revealed publicly he had also lupus.