Conversation: The conversation between human and AI assistant.
[|Human|] My 2 year old son has a purple bruise with a white center. When I touch the White centre I can feel a bump or knot under the skin. He isn t feeling any pain and the bruise is yellowing, I cannot see any puncture, but we are worried about the knot which isn t going away. What could it be?
[|AI|]  Hi... Thank you for consulting in Chat Doctor. By what you quote I feel that it could be a hematoma and if it has occurred spontaneously, then it points out to a diagnosis of bleeding disorder either acquired or congenital. This requires evaluation. But... Skin conditions are best diagnosed only after seeing directly. I suggest you to upload photographs of the same on this website, so that I can guide you scientifically. Hope my answer was helpful for you.  I am happy to help any time. Further clarifications and consultations on Chat Doctor are welcome. If you do not have any clarifications, you can close the discussion and rate the answer. Wish your kid good health.