Or, really, maybe it's something that's been there all along, but because he's had the long hair for so long, we couldn't spot it?

Also, sometimes we just don't notice stuff like that. I have a faint red birthmark on my forehead. Dear friends who've known me for years will sometimes say "Oh, did you hit your head?" And I'm like "wha?" And they say "It looks like your forehead is all red." And I say, "Nope, that's been there since I was born." Then they feel horrible and unobservant. And I assure them that that happens all the time. :)