My daughter is twelve years old, color Doppler ultrasound results are umbilical visible lymph nodes,

Among them, lymph nodes are not serious and can be cured under active treatment conditions. Generally, it is caused by mesenteric lymphadenitis. You need to take your child to the pediatrics department of the hospital in time for ultrasound, blood routine examination, etc., and use sensitive antiviral drugs or antibiotics under the guidance of the doctor.