My 5 year old woke up this morning with a red & itchy rash coving most of his body. Its worse on his back, neck, behind ears & stomach. Through out the day it has not gotten better or worse really. Looks red and pimple like. Very small bumps my if I sqeeze it white puss comes out. He has not eaten or been exposed to anything new or different. Help! What is it? Do I take him to his pediatrician?