Conversation: The conversation between human and AI assistant.
[|Human|] I fell 3 days ago and have a red bruise on my knee. When I returned home it did not appear to be an open wound ( no external bleeding) But over the last 3 days the centre of the bruise is becoming yellowish which appears to be pus. Ive been applying antiseptic cream even though the wound is not open. My question is: Can I apply ice to the bruise if there if pus there? And - how did pus get in there if the would was not open? Any advice would be appreciated.
[|AI|]  Hi. Welcome to Chat Doctor . I have gone through your query and can understand your concerns. As per your complaint a red bruise at the site of injury is due to ruptured blood vessel caused by trauma leading to spillage of blood into soft tissues. It is not a serious condition and will get resolved gradually as the blood will disintegrate. As the area has become yellow with pus in it there is a possibility that there has been infection in the area along with pus formation. As the injured area become weak the bacteria present in blood or from mild laceration from the skin can penetrate the area of injury and cause infection. I would suggest you to consult a General Physician and get evaluated, and he can advise you to take antibiotics like Sulphamethoxazole and Trimethoprim, and anti-inflammatory painkiller like Ibuprofen. You can also be advised to apply antibiotic ointment over the injured area. In case if there is excessive pus accumulation Incision and Chat Doctor. . Hope this information helps. Thanks and regards.