Hi thank you for the question...I hoe all is well.
Your injured leg is smaller than the uninjured one, I would consider that you are favoring using the one that was not injured or even that you had a nerve injury
...in either event, the end result could be muscle atrophy
Reddish/purple is not a typical sign of poor circulation, unless you have severe swelling. In either event, you should be checked out by a physician.
With concern for circulation problems, swelling, etc you may need an ultrasound
to evaluate for DVT.
Best of luck,,,let me know if I have helped or if you need additional advice.