... which might make Ned feel a little better.
AND just WHAT did I do to deserve that?? I'll have you know that some significant fraction of women find bald sexy! Geez!
But on topic. Mike commented about losing information. This is a bit of an oversimplification. As noted elsewhere it depends on what the, in this case hair loss, genetic change was. It might be a simple mutation in a control that could have some not too small probability of being reversed. The hair loss could even be due to the addition of some inhibitor with some complexity. In that case any "break" of the inhibition would bring back the trait being inhibited.
It isn't as simple as "losing" a gene for hair.