Normally if an individual notices a bump on their head following an injury they do not need to seek medical attention unless they lose consciousness or experience other unusual symptoms, according to National Institutes of Health MedlinePlus. Other symptoms that would require immediate medical attention from a head injury include extreme sleepiness, abnormal behavior, vomiting and different sized pupils.
A lump on the head following an injury is caused by bleeding in the brain tissue and in surrounding areas under the skin. If a child has suffered a head injury, it's crucial to monitor them closely for the next few hours and take them to a doctor if they exhibit unusual behavior. Head injuries that result in excessive bleeding should be looked at by a medical professional as soon as possible to prevent serious brain damage from occurring.