Before we had bicarb dialysis, patients were yellow-- we all looked like we had jaundice. (The old dialysate had acetate, which increased bilirubin and made everyone's skin yellow... bicarb dialysis avoids this.)
Before I got sick I was very pale... I looked like a vampire.
Then I got yellow, then pink after the transplant (I always had high blood pressure), now I'm back to a somewhat normal skin tone.