Swelling on the inner side of my knee, no injury and sometimes upper leg pain had ultrasound done vains r fine could it be lymphedema?

Probably not: If at the joint line a cyst from the medial meniscus can do this. This can occur wth meniscal tears. Other possibilities include a lipoma in the skin and, rarely, muscle herniation through a defect in the tissues surrounding muscle. Mri may help sort this out.

Not likely. : Lymphedema will typically affect the entire extremity or large section of an extremity.