Here's what I found out about birthmarks:
Some believe that café au lait spots result by a death in a previous life.
Many other beliefs surround birthmarks as well. Some cultures believe that birthmarks are lucky and should be touched. The Italian, Spanish, and Arabic words for birthmarks - voglie, antojos, and wiham, respectively - all mean "wishes." Others believe that they are signs of evil, that the child is "marked" by a demon. Some birthmarks may have special meanings depending on their shape. Some birthmarks appear in shapes similar to hearts, stars, or crosses and may signal good luck or even religious divinity. Some believe that birthmarks are "gifts" from other powers, which is evident by some of the names of certain marks such as "stork bites" and "angel kisses."
<Please edit out all formatting before posting. Thanks, Nyx>