Blood clot blockage. Some plaques are susceptible to cracking and forming irregular surfaces within the artery wall. The catheter website may continue being tender, swollen and bruised for a couple of days. There might be a small space of discoloration or a small lump in the area of your puncture. https://www.sgvascularctr.com/revealing-the-latest-innovations-in-carotid-artery-disease-treatment/