I have studied your case.Stress injury
on treadmill can lead to bruise due to hematoma
If there is stress fracture
in your leg bone then it is difficult to walk on it
You will need X ray of knee and leg.
For these symptoms analgesic
and medication can be started.
Till time take medication like analgesic and apply crepe bandage over leg or use supportive splint. Do ice fomentation and rest to leg.
If required you may need to do blood investigation for prognosis and recovery.
Colour Doppler study will help to know any vascular injury
Take precaution to avoid infection around hematoma.
Hope this answers your query. If you have additional questions or follow up queries then please do not hesitate in writing to us. I will be happy to answer your queries.
Wishing you good health.