I Took A Long Haul Flight 12 Days Ago. I

I took a long haul flight 12 days ago. I don't remember knocking my calf but I developed a 3 inch circular bruise. I noticed a small lump within the bruise area which was sore to the touch, this has gone down a little and is about the size of a pea. There soreness has reduced as well. No swelling or reddening of the leg. I'm due to do my return long haul trip Monday overnight.