Thank you for sharing your query on Healthcaremagic, I have carefully worked through your case, although your son doesn t have any local signs like swelling, bruises or pain complaint, he is drowsy due the trauma and any chance is really important, I don t suggest to you go inmediatly to the hospital just pay attention and watch carefully if the drowsiness is increasing or others neurological symptoms start to show up, like blurry vision, nausea, vomiting, motor imbalance or something abnormal then you can take him to the emergency room Please kindly rate if my advise has been helpful Wishing you a good health Dr Tania Portelles-Driggs