Going out of my mind with worry here.
Does this look like it? I had a 9 hour flight last Tuesday (9th) although 2 days later I had quite a bad fall over a lose paving slab and banged my knees up pretty badly so when I first noticed this I thought it was from the fall.
Now my ankles (although both not just the side with this) have swollen and the leg this is on feels quite tight.
I think I'm going to have to try & see a doctor tomorrow but I'm reluctant as there's only me & DD here.