Many babies have rashes that are more noticeable after birth.
One of them is called "stork bites". They are red flat oddly shaped marks that can be in the nape of the neck, on the lids and sometimes on the nose. These are quite harmless. There can also be "strawberry hemangiomas" that tend to appear after borth and do tend to grow. Depending where they are, they may give a bit of trouble.