One is the focal pattern wherein depigmentation occurs in a limited area .
一是协调格局下局部地区发生脱失.
As regards natural selection , depigmentation allows greater penetration of the skin by ultraviolet b ( uvb ) , which is needed to synthesise previtamin d3 .
Conclusions skin changes of arsenism begin from hyperkeratosis , next affected by depigmentation and hyperpigmentation .
结论地方性砷中毒皮肤改变从角化开始，先后出现脱色和色沉。
The former refers to the radian brow , eyebrow in the direction and continuity , but still eyebrow health ; the latter refers to defect or depigmentation eyebrows , mostly because of chemical injury , thermal burns or skin diseases caused by limitations .
But in some parts of the world , such as central africa , mutations that result in albinism ( or a significant depigmentation ) of a baby can provoke fear and superstition and sometimes even infanticide .
