What are the chances of being born with hypertrichosis?

Hypertrichosis, often referred to as "werewolf syndrome," is an extremely rare condition characterized by excessive hair growth. The chances of being born with hypertrichosis are estimated to be about 1 in 1 million people, though the prevalence can vary depending on specific forms of the condition and genetic factors. It can be congenital (present at birth) or acquired later in life. Overall, it remains one of the rarest genetic disorders.