Sometimes they're seen as flaws and concealed; other times they're painted on as a fashion accessory. In his book "Freckles", Swiss photographer Reto Caduff expresses his love of freckled faces.

Freckles are hereditary and common among pale-skinned and red-haired people, but can also appear on those with dark complexions. They crop up via pigment deposits in the skin, usually caused by sun exposure in summer before fading again in winter. Documentary filmmaker and photographer Reto Caduff managed to take pictures of 50 models by daylight. His book "Freckles" also features a scholarly introduction by British-Irish dermatologist Jonathan Rees.