大约有5%的白人由于基因突变而产生雀斑、白皮和红发。
In about five percent of white people the gene is mutated leading to freckles, fair skin and red hair.
有雀斑的人呢，他们的黑色素细胞数量是正常的，只是他们的黑色素细胞产生了一些黑素。
People with freckles have a normal number of melanocytes; their melanocytes just create clusters of melanin.
因为新生婴儿没有在阳光下晒过，他们就没有雀斑。防晒系列产品的使用和衣服都可以防止雀斑的产生。
Because newborn babies haven't been exposed to sun, they not have freckles and the use of sunscreen or the clothing protection can prevent freckles.
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