My son has had a swollen lymph node in his neck for the last 10 weeks was less than a cm but now slightly bigger than a pea. It is on the left side halfway between ear and shoulder where cervical lymph nodes are situated. He has had no illness apart from headache and a on and off temp. He also has a smaller lymph node just developed underneath
its due to low immunity. even a minor cough,cold can cause lymph nodes to enlarge.
if it enlarges significantly then, start antibiotics. lymph node may be rarely needed if it doesnt respond to antibiotics