Three yellow blisters after the knee abrasions scar off.

After knee abrasions scar off, long 3 yellow blisters are mostly considered to be caused by purulent infection of the wound site. You need to go to the hospital for debridement and disinfection of the wound site to control personal infection symptoms. At the same time, you also need oral cephalosporins, roxithromycin and other anti-inflammatory drugs.