Some yellow fluid in the pus of the wound is normal. But if the wound drainage is ongoing and the pus becomes a deep yellow or produces a foul order, it can be a sign of infection. Start by cleaning the wound with cleansing solution to help improve the condition of the wound and the infection. You should consult with your physician immediately as you may need to return to the hospital if you have been sent home. Infections can usually be cleared up rather quickly with appropriate care. If the infection is not cared for, it can cause serious complications. In most cases, antibiotic treatment will help rid the body of the infection and allow the wound to continue to heal properly.