Thanks for the query,
Its good to know that you dont have any other symptoms, other than the bruise
This rules out an internal injury
Dont worry about the bruise.
Usually it takes around 2 weeks for the bruise to heal,
you can use oint thrombophobe to get a faster relief.
Please meet a dermatologist
for exact diagnosis.
Let me know if you have any other doubt.
you can ask a direct question to me on this forum, following the below link.