mrcem2-1481

A 6 year old girl is brought into the emergency department with a 4 cm swelling to the left side of the forehead. The patient’s father tells you the child’s sister accidentally hit her with a toy and it struck her in the head. There was no loss of consciousness, no vomiting, the child cried immediately and is behaving normally. You diagnose a minor head injury. The patient indicates they have slight discomfort on the RCEM pain scoring tool. Which of the following is the most suitable pain relief to provide?