How can I emotionally handle changes to my skin and appearance after pregnancy?

Difficult. This is tough. Pregnancy hormones cause many changes to the skin: drk areas and dark lines, moles that grow and darken, acne, rashes etc. Most changes improve or resolve after delivery but can taken a long time. Some women try bleaching but the pigment changes extend down to deep layers of the epidermis, which require a long time to clear through slow exfoliation. Avoid the sun.
Pregnancy. Realize that you are exactly the same person you were before the pregnancy, except that you have one big asset and advantage – you have a child.