I had a heart catherization August 19 n after 2 days a large knot appeared a couple inches above where they went in when they did the cath. It was hard and really sore which made it difficult to walk. After 5 days I developed a large sore under the lump which was red and purple. It started seeping a white substance along with cloudy blood drops. it continued to drain for 2 days. Now the area is smaller and not quite as purple and still leaking a little substance. Above that area is a much smaller knot but its not sure .