Just grepped through the book and found the incident you mentioned, but there's nothing about Vaseline and hydrogen peroxide. Are you sure you didn't read about this in a different book? If so, any idea where?

  So, it was several days before I realized how bad
  things really were. My face was swollen to the size of
  a pumpkin, badly charred from being blowtorched.
  Ol' Stan Bear came in and sat down. He said, "Well,
  Chuck, I've got good news and bad news. The good
  news is that your lungs have not been permanently
  damaged from inhaling flame and smoke, and your
  eye looks normal. The bad news is I'm gonna have to
  hurt you like you've never hurt before in your life to
  keep you from being permanently disfigured. And
  I'm gonna have to do it every four days."

  I stayed in the hospital a month, and every four
  days, Doc started from the middle of my face and
  neck, scraping away the accumulated scab. It was a
  new technique developed to avoid horrible crisscross
  scars as the skin grew beneath the scabs. And it
  worked beautifully. I have only a few scars on my
  neck, but my face healed perfectly smooth. The pain,
  though, was worse than any I have ever known.