Dear friend, welcome and thanks for entrusting your query here at HCM!
I am Dr. Prasad Akole (Critical Care Expert- http://bit.ly/Dr-Prasad-Akole) and am glad to address to your query here.
It is indeed a bruise
with some skin bleeding due to the hit by the kick to the shin bone.
The swelling, pain, bluish discolouration is a bruise.
Nothing to worry. Just take some rest, pain killers like NSAIDs (over the counter meds) and it will go away in few days. The blood takes a few weeks to get absorbed.
No special treatment is needed. be careful next time !!
I hope you are fully satisfied with the guidance I gave.
Hope I have answered all your questions. I would be glad to answer any further queries. Please ask for any clarifications before closing and rating this answer.
Thank you and Good luck!