World ‘Werewolf syndrome’: 17 babies with out-of-control hair growth in drug mixup, reports say August 28, 2019 Joshua Bote, USA TODAY Comments Off on ‘Werewolf syndrome’: 17 babies with out-of-control hair growth in drug mixup, reports say A medication mixup has led to more than a dozen babies being diagnosed with hypertrichosis in Spain. But what is "werewolf syndrome"?