Hey Mommies. I am a mother of two little boys!! My oldest will be 4 in March and my youngest will be…

Hey Mommies. I am a mother of two little boys!! My oldest will be 4 in March and my youngest will be 1 next Friday!! Well my youngest son Jax has had these small knots at the base of his skull towards the right and left sides of the back of his neck. They are small pea sized nodules that have been there for nearly 6 months. Everytime I take him to the doctor he always tells me that they should go away in a couple of weeks. Well they have yet to go away!!! Should this be a cause for concern?!?