Swollen Index Finger !!!!!

MMMMM, This I think is a different one! My index finger on my left hand the same side as my operation has swollen to nearly treble the size !!

I do have a little nick on the side of my finger but not hot,or sore…

Any suggestions as to what this can be as i´m stuck on this one?

I do have Lymhodemia, but mainly at the top of my arm…

Thanks, love Teresa xxx