Conversation: The conversation between human and AI assistant.
[|Human|] Hello. My 8 year old son hit his outter thigh on the corner of my end table rather hard after falling off my bed. Initially, there was mearly a scrap with a tiny bit of discolouration around the wound. About 1.5 hours after the accident, the area swelled about the diamiter of a tennis ball and half the height off his leg. Bruising has reach the top of the skin. My concern is the size of the lump. Should I seek medical attention for him?
[|AI|]  Hi. Welcome to ChatDoctorHe is developing hematoma/ blood collection under skin. If he can walk and no pain means bony injury is least likely. If size is increasing persistently and rapidly that means bleeding is active and needs surgical exploration and stopping of bleeding. You should see a surgeon at least once. Mostly it will resolve on its own but will take long time due to its large size. No tablets required. Regards.