Hello, I Took Two Flights This Morning...total 5.75 Hrs Airborne.

Hello, I took two flights this morning...total 5.75 hrs airborne. This afternoon I have patches of blotchy red & white on the right side of both shin bones. Left leg patch is larger & hotter. No pain or tenderness, and it is clearing over the course of a couple of hours. Can you tell me the likely name and whether flights are the most likely cause, please? No streaks, so I do not suspect blood poisoning, but it's hot like when I had that (many decades ago).