3. Hypertrichosis (Werewolf Syndrome)
From the very name of the syndrome, you can guess in what way it affects those who are diagnosed with it. Werewolf syndrome ranks third on our list of uncommon genetic mutations in humans. It is characterized by excessive hair growth. The condition affects both, men and women. Depending on the type of hypertrichosis, hair can cover the whole body or be restricted to a certain area of the body. The exact cause is still unknown. Less than 100 cases of werewolf syndrome were documented worldwide, making it an extremely rare occurrence.