Identification of a werewolf in human form is quite difficult, and there is no one way to tell. European legends reference some physical characteristics including distinctive heavy-set eyebrows, low-set ears, and curved nails. Many other legends around the world reference different traits including dark thick hair and long middle fingers – or odd characteristics such as hairy palms.
All these identification methods are hit or miss however as not all or necessarily any of these characteristics will apply to all werewolves.

There is however a more agreed upon method to identify a werewolf, which is through the eyes – werewolves in human form are said to have very distinctive eyes that draw you in.