Walsh (1971) described a pigment anomaly in New Guinea natives. The skin is reddish-brown rather than black as in other natives. Melanin is present, however, and increases with age. The color of the hair varies from the usual ... Walsh (1971) described a pigment anomaly in New Guinea natives. The skin is reddish-brown rather than black as in other natives. Melanin is present, however, and increases with age. The color of the hair varies from the usual black to almost white. Nystagmus and photophobia are variable features. An enzymatic defect in melanin formation was posited.