FIGURE 69.16 Infant with urticaria pigmentosa and positive Darier sign Partial albinism occurs when localized areas of skin and hair are devoid of pigment Ocular albinism is also seen Two syndromes with albinism are Waardenburg syndrome (white forelock, heterochromia of the iris, and sensorineural hearing loss) and Chediak–Higashi syndrome (immunodeficiency and leukocytes with giant granules)