HI. welcome to HCM. I am Dr.Ganesh
A mass after trauma could be anything depends on duration after your fall. if it is recent trauma it can be a haematoma
. If it is of remote time it can be a myositis ossificans
or any tumour,
So it will be necessary to get evaluated by doing Xrays of your leg and also consult with your ortho doctor.
Also go for Doppler study of lower limb as your toes gets blue , so that proper blood flow to toes can be evaluated.