Besides being extra sensitive -- it is arguably the most delicate part of the face, after all -- the under-eye area can also reveal sins like no other. Stress, dehydration, lack of sleep -- they all have the potential to creep up as dark circles (a note: hereditary factors and bone structure also play a role for some), which, we can all agree, never make for a good accessory. But, in our desperation to mask them, many a mistake is often made. With that in mind, we asked makeup artist Pati Dubroff, who tends to an impressive roster of red-carpet regulars (Charlize Theron, Taylor Swift and Eva Mendes, among many others), to shed some light on how to properly attend to under-eye darkness.