How to get rid of these in the folds of my son's neck. I always see these is no water or sweat in such areas. Also did not face it since his birth. Please suggest

A. That has got accumulated into that area which is why it is looking like that that is just dirt and nothing else so what you do is when your child is awake apply Boroline antiseptic cream in that area by opening the up the fold let it make it little soft then you can eliminate the dirt with the help of a soft cloth or cotton and after that you can apply Any good cream of your choice or Boroline again