Following is the info CricketHip has left elsewhere on the forum referenced by VSlowLife above -
Take deep breaths.. deep, as in breathing in to a count of 5, or 4, whatever is best for you. hold it for another count of 5/4 then blow out completely, still using the count that's comfortable for you. A series of at least 6 of these could help get any swelling to move. To ensure you are taking proper deep breaths, place your hand right above or at your naval and watch while taking in your breath, if doing this properly you should see your hand move up.
Do this whenever you feel up to it during the day or night. The more supine that I could get in the recliner or bed, the more effective this was.. you have lymph nodes seated there in your groin and sitting up too much can cause a restriction of sorts.
You can, after the breathing, place your hands lightly on your upper thigh, right where the crease is in your groin and lightly stroke upwards towards your naval.
I did this quite a bit post op and while it takes a while for the body to wake up and respond, it will and it will help get things moving.
The reason this can help is because our lymphatic system doesn't have our cardiovascular system to help lymph fluids move.. no assistance from the heart pumping. Our breathing and our physical (muscular) movements keep it flowing.