Hi..I just came back from my pediatrician and she is referring me to a pediatric dermatologist for a horse shoe pigment on my sons face on the cheek but starts right at the bottom of the lashline and develops downward. He turned 3 in Feb.and this developed last June..It is getting just a little darker..She said she wanted an expert to look at it.. but she said she didnt want to say what she thought it was. She also said she thought it could be related to certain skin diseases. Could this be typical of some type of a skin cnacer or other disease?