Knowledge required for this riddle: English-language proverbs.
My friend Leonard came to me with a problem the other day. He said, “Tanner, I want to have a clean-shaven face. But every time I use a razor, I end up with this nasty painful rash.”
“Razor burn,” I said.
“Yeah, that's right,” said Leonard. “Do you have any advice for me?”
“Unfortunately, there's no good solution,” I told him. “You're going to have to either grow your beard out, or just cope with those painful rashes.”
Why will Leonard have to grow his beard out?