Momma's I need some advice. Kynton has had 2 small white bumps on his head since birth. The bumps…

Momma's I need some advice. Kynton has had 2 small white bumps on his head since birth. The bumps were the size of the ball point of a pen. While I was at one of my dermatology appointments I had my dermatologist check it out. He said it looked like molluscum. So he used liquid nitrogen to freeze them in hopes they went away. Well they never went away. As of yesterday 1 of the bumps on Kynton's head is now the size of a pea (maybe a tad bigger) and hard and red. When should it become a concern to go to the ER? Each well baby the Dr said they were fine it would go away and now this. Not the best picture but all I could get.