Injection area pain. Sir am worrying.

Hello sir My sister taken injection some diclofenac and glucose 1 given for cough and weakness now the fever was cure in 2 days only .. We have taken injection on 22feb but since the area was redness and pain and like swelling like  big button type.. The doctor was said earlier may be the injection problem than he wrote some tablets for 3 days but its not cured.. Again 3 days he written ointment and other tablet no use.. Than now on today he saying not a Injection problem better to show surgeon he was saying.. We can't understood what happen she can't able to walk getting pain even on sleeping movement also Pls suggest what I have to do and to which doctor I have to show I stay in hyderabad sir am Worrying...