See Your Doctor: 7 yr old with "pea size lump, back of knee". A mass of the description given has a few causes. Popliteal cysts commonly occur in this area, are usually benign but can have serious complications. Tumors and blood vessel anomalies can also occur. Diagnosis may require an ultrasound depending on the physical findings. Visual inspection is needed. See your doctor for correct diagnosis and treatment.
Answered 8/9/2014
3.8k views
Knee lump: It could be a lot of things ranging from insect bite reaction, splinter, lymph node or cyst or even a lipoma. If it bothers her, have your doctor check it and test it if needed. If it does not bother her, is non tender, mobile and not growing, you can wait till your next well check up.
Answered 12/8/2015
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