What Causes Chronic Swelling And Redness In The Toe Post Injury?

Hey doc , my toe is swollen all the time , it all started when i hit it against a wall right in the middle ( not in the corners ) and since that day it has been red and swollen , its been a year already , it doesnt hurt me its just displays redness and its swollen, sometimes it gets closer to the normal skin color and it cools off but not 100% and sometimes i gets red again, what can it be ?