My son has a birth mark on the side of his face & under his eye on the same side. When he was born I was told it was a pressure mark & it would probably be gone by about a year old. He's now nearly 4 & it hasn't gone.
It's never bothered us it's just normal to us but today at a Drs appointment for something else the dr asked if anyone was 'keeping an eye on it' 
Is that a thing? Does it need an eye kept on it, I had no idea!
It's not a dark one like a port wine type birth mark he actually does look like he's had a bash on the face which is why so many people ask about it thinking he's hurt himself, I'll try & post a pic incase anyone has any answers 