What is the difference between a hematoma and an ordinary bruise? are they pretty much the same? any difference in healing time?

Bruise/hematoma: A bruise is a discoloration of the skin due to leakage of blood from a small blood vessel or capillaries (usually due to trauma). A hematoma is the same except there is an accumulation of blood so that it creates a bump on the skin or a collection of blood within the body.

Hematoma: usually means a collection of blood that formed into a mass. Bruise, or ecchymosis, is diffuse bleeding into subcutaneous tissue. In general, hematomata represent more severe bleeding and thus will take longer to heal. Some hematomata can organize and need aspiration or even surgical drainage.

Sort of: A bruise is a mild collection of blood in the tissues which come out of the surrounding tissues and superficial vessels where we have been traumatized. They are sort of a hematoma but when we think of a hematoma it is usually a larger collection of blood which forms a swollen area and can be painful or even get red or have other problems. This is a simple explanation and hope this was informative