The formal name for the discoloration is punctate leukonychia, also sometimes called milk spots.
变色的正式名称是点状白甲, 有时也称为乳斑。
英语百科
Leukonychia
(重定向自Punctate leukonychia)
Leukonychia (or leuconychia), also known as white nails or milk spots, is a medical term for white discoloration appearing on nails. It is derived from the Greek words leuko ("white") and onux ("nail"). The most common cause is injury to the base of the nail (the matrix) where the nail is formed.