During pregnancy, all the hormones can make it so that melanocytes come to the surface, not only in that linea nigra, but you can notice darker areas in your skin and your face and other places.

怀孕期间，激素的变黑色素细胞更加活，不仅在妊娠中线，还可能导致皮肤、面部和其他部位变得更深色。