Both presidential candidates had hair surgeries

I know that Biden had hair transplants in the old days with ‘plugs’ but got these repaired some years ago so he looks normal now. Trump I know had a Scalp Reduction (cutting out the bald spot in his crown) but I am not sure if he also had hair transplants. The scalp reduction left him with a scar down the middle of his head. I think that he wears a high end hair piece now.