Spanish infants are developing “werewolf syndrome” due to their parents taking a popular over-the-counter hair-loss remedy — with nearly one dozen cases since last year, according to a new report.

Medically known as hypertrichosis, werewolf syndrome is an extremely rare condition characterised by excessive hair growth.

Werewolf syndrome is a colloquial term attached to ancient legends that mention the growth of hair by men at the appearance of the new moon. Scientifically, it is referred to as Hypertrichosis, which ...