Freckles are just your average normal skin cells that contain an extra bit of melanin, a special dark brown pigment that helps protect your skin like sunscreen.

雀斑只不过是普通的正常皮肤细胞，不过里面含有额外的一点黑色素，这是一种特殊的深褐色色素，可以像防晒霜一样保护你的皮肤。