Ok, the other day(Sunday) I noticed Jesse's neck looked dirty...didn't think anything of it because he was wearing a dark shirt and needed a bath. DH gave him a bath that night because I was working. I forgot about it and DH didn't say anything. Tonight I put him in the bath and scrubbed him down good. When I got him out the "dirt" was still there. I am assuming it's the type of birthmark known as a cafe au latte stain.I have a small one on my thigh that has been there since I was born. My concern is Jesse is five years old and NEVER had this before. It starts under his ear and runs down under his chin where it's a little darker, so it's pretty big. Is it normal for a birthmark to suddenly show up after five years? Should I worry, call the doctor about it??? He had a check-up in March and was perfectly healthy and still seems so....and the mark was not there at his check-up. Could this be a symptom of something else that I need to be worried about....what I find on the internet is NOT encouraging, but he doesn't fit any other symptoms of the "rare diseases" this could be associated with. HELP???!!!