I think I managed to fix that weird hair glitch on my teen fairy dude. I aged him back down to child from teen and saw that the hair on his face was gone. Then I aged him back up to teen and he was fine. This is what he looks like now.
Before long I noticed hair protruding from his arms and when I removed his shirt I saw the following. Where did this body hair come from, anyway?
Now I am just counting down the sim days until he ages up to adult. I will keep you in the loop if you are interested to know how this big hairy saga concludes.