Hi thanks for your question.
Since trauma is 1 week ol there is nothing to worry.The lump he has developed is most probably heamatoma(collection of blood under skin) due to bleeding under the band aid.The swelling on bridge of nose and on one eye is due to pressure of haematoma
.I would suggest you to consult a general surgeon
,who may be able to examine him and may advice investigations like X Ray
skull and may prescribe him antibiotics and analgesics anti inflammatory drugs.
Hope this answers your question.