Werewolves are just something we hear about in scary stories, but this condition will make you believe they exist in real life. Also known as werewolf syndrome, hypertrichosis is excessive hair growth all over a person’s body. It’s so rare that only 50 cases have ever been documented. The causes of this are not well known, but it frequently runs in families and can be present at birth.Do you or someone you know have a rare and unique body part? Tell us about it in the comments.