Swollen lymph nodes are an indication that your body is fighting off an infection. This could be a minor infection, in which case, the lymph nodes will go back to normal soon. I get swollen lymph nodes behind/below my ears all the time but they always go away.
When to see a doctor
Some swollen lymph nodes return to normal when the underlying condition, such as a cold, resolves. However, see your doctor if you're concerned or if your swollen lymph nodes:
Have appeared for no apparent reason
Continue to enlarge, or have been present for more than two weeks
Feel hard or fixed
Are accompanied by fever, night sweats, or unexplained weight loss
Are accompanied by a sore throat or by difficulty swallowing or breathing
Are red, warm and tender