Had complete knee replacement on 12/16/13,infection developed, had drainage procedure on 1/20/14, and on IV antibiotics thru picc line 2 times daily. Doc visit last Friday, said if red on Tuesday come back, The incision area had sutures removed las Friday, tech pulled part of scab off because of how sutures were placed. Overall appearance of knee slight redness but not bright rad more a dull appearance and a slight swelling. Incision scabbing is forming and healing, steri strips put in place to help keep incisionfrom tearing. How do you determine if going back to doc is necessary?