<s>[INST] hello. my 5 yr old son hit the upper back of his head while in bed. his bed frame is wood. I m wondering if I should take him to the er tonight or wait and call his doctor in the morning. its a goose egg on his head, but it also appears a lil inverted. [/INST] Is there any other symptom like vomiting, loss of consciousness,  drowsiness etc.If not then there is no need to worry. Most probably it's a haematomaYou can go CT brain. Give some painkiller to the child like syrup ibugesic plus 5 ml twice daily.The haematoma will subside in a weeks time. </s>