What is the situation when there are bumps behind a baby's ears?

Patient's question:

Symptom Description: Just discovered
Medical history and treatment effectiveness: None
Laboratory and test results: None
Help needed: Want to know what symptoms it is

Doctor's answer:

From the situation you described, it is likely caused by swollen lymph nodes, which are highly related to viral and bacterial infections. If the surface of the lymph nodes is smooth and they can be moved, there is no problem, and it can be observed. However, if they increase significantly in a short period, it is necessary to seek medical attention promptly. Generally, this condition is considered to be related to lymph nodes, as there are many lymph nodes in the human body. You can go to the hospital for a color Doppler ultrasound to check. Lymph nodes are part of the human immune system and are not a disease. Don't worry.