<s>[INST] I am a coumadin patient and last week I bumped my lower leg pretty hard on the side of the tub and not only do I have a huge knot on my leg, but I have lots of bruising and bruising that has developed around my ankle and the top of my foot.  Also have lots of swelling in lower leg. [/INST] Hello! Thank you for the query. As Coumadin prolongs blood clotting, the most probable reason of your symptoms is hematoma. Due to recent injury some veins were ruptured and blood has appeared outside the vessels. Coumadin patients usually have such hematomas much larger than other persons.  According to mentioned symptoms, most likely you need surgical intervention. The hematoma needs to be incised and Chat Doctor.  Otherwise, the inflammation which is present will get worse. Hope this will help. Regards. </s>