What Causes Bruising On The Sole Of Foot In The Middle?

Hi, may I answer your health queries right now ? Please type your query here...Hi, I've developed what I would describe as a feeling akin to bruising on the sole of my right foot in the centre to the inside of the ball. I don't recall landing badly on it or anything that would have bruised it. Are you aware of any other conditions that this could be?
Many thanks