Conversation: The conversation between human and AI assistant.
[|Human|] my baby has a hard lump at the back of her ear and it seems to be getting bigger iv been to hospital with her and they said its not a lingth nod and they will do an ultra sound scan it is hard and moves and it dosent seem to be bothering her but its worrieing me can you tell me what it might be to reasure me
[|AI|]  Most common swelling is a lymph node which resolves gradually if there is no local infection. But as you've mentioned it's not a lymph node and that its hard and painless, its more likely a cyst, which is fluid filled balloon like sac. Other possibilities are fat or soft tissue. This can be differentiated with an ultrasound scan. Either of these is benign condition and needs conservative measures. Scan is to confirm the nature of the swelling and hence to manage appropriately