This local hematoma is formed after blood vessel puncture. Well, look at that catheter. First of all, you need to make a sheath, usually 7F8F, which is thicker than the general syringe needle. Of course, there will be local bleeding after puncture, and hematoma will be more obvious when puncture is slightly damaged.

Generally speaking, this is not serious and does not require special treatment. Because this is not an important complication. I will gradually dissipate, but I will not completely dissipate, there will be local induration, and it will shrink with time. There is no need to make a fuss.