Hello
You don't mention how long you've had this.
For tonight put ice packs on it, and take motrin or advil for the swelling. Rest and elevate your leg as much as possible. You will want to then make an appointment with your doctor to find out the cause so you can be treated properly. This could be anything from loose cartilage, fluid on the knee, or a cyst on the back of the knee.
Kerry
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Kerry, RN
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