You may have suffered some muscle damage and bleeding within the muscle. If it is deep then the superficial bruising may not indicate the severity of the injury
. The warmth you feel may be the inflammation but it may also be a sign of infection developing in the muscle.
I would suggest you see your doctor who may wish to examine your leg. If there is an infection you may need to take antibiotics.
I hope this helps you.
Dr K A Pottinger