当维生素缺乏时，首先会变现在表皮系统（包括毛发和指甲）。
The integumentary system (which includes hair and nails) is often the first place that a serious vitamin deficiency shows up.
白化病：指双眼、皮肤、毛发、鳞片、羽毛等缺乏黑色素的情况。
Albinism: ABsence of the pigment melanin in the eyes, skin, hair, scales, or feathers.
眼皮肤白化病是一组与黑色素生物合成有关的遗传性疾病，表现为眼、皮肤、毛发黑色素缺乏等。
Oculocutaneous albinism in eye skin is a series of hereditary disease related to melanin biosynthesis, which is mainly short of melanin of eye, skin, hair and brings various hazard to patients.
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