Port-wine stains and hemangiomas are common birthmarks. Often, some of these marks, like the very common, red patch or ‘stork bite’ on the back of the neck, resolve over time, often by age 4. It’s important to show these marks to a pediatrician, since they often show themselves sometime after birth. Mostly these marks just affect the skin, but less commonly they are associated with other symptoms, so examination by a pediatrician is important. They can be treated shortly after birth, or at any time in a person’s life. I often treat port-wine stains for the first time in adults. Often people seek treatment because flat birthmarks develop raised areas over time, or simply because people seek treatment after hearing about how well the newest generation of lasers work at removing port-wine stain birthmarks.