I'm really scared (my nature) because I had my son's blood tested last week because he's had swollen lymph nodes now for quite some time. The test results showed his white blood count was a little low. They said his was 3.7 and normal was 4.2. So - we are having it re-tested this week. Doctor presumed the swollen nodes were due to drainage as he fights allergies. But we have him on Singulair and Zyrtec and that seems to now be under control. He did not have a virus (to my knowledge) at the time the blood was tested. Since he was an infant - any time he had a cold, runny nose, sinus infection, etc. the node in his neck would get really big. Right now they aren't huge, but they are definitely there and not going away. What could this be. I'm really scared.