Is bruising common for tendonitis on top of foot?

Hello. Thank you for posting.

A bruise on top of a foot can be a sign of extensor tendonitis which is usually caused by repetitive and prolonged rubbing against a shoe.  Spending too much time walking, running on uneven surfaces, and tying your shoes too tight are some of the most common triggers. Hard blows on the foot, when someone drops a heavy object on it, can also cause this condition.

Helena