Conversation: The conversation between human and AI assistant.
[|Human|] I have a painful, purple-colored lump that is under the skin and does not have a head as of yet. I first noticed it 5 days ago as a sore red bump, but now it looks more purple in color and is sore to the touch. I have heard of MRSA and Staph, but do not know exactly how they present. Any info is appreciated.
[|AI|]  Hello! Thank you for the query. Please do not think about MRSA. This kind of infection is usually caused by long stay at a hospital. Healthy people or never hospitalized people usually never have any MRSA problem. Of this lump is on the leg, varicose veins is the most probable reason. If it hurts, blood clot can be inside. If it is on the other location, sebaceous cyst which has gotten infected can be the reason. I suggest you to consult your doctor with this issue. Hope this will help. Regards.