Final answer:
The patient should immediately seek medical attention due to the potential for a serious head injury, such as a hematoma that could put pressure on the brain. Administering pain medication and applying ice could be secondary considerations, but professional evaluation is critical.
Step-by-step explanation:
The most appropriate treatment for a patient who has been struck in the side of the head with a steel pipe and is experiencing blood-tinged fluid draining from the ear and bruising behind the ear is to seek immediate medical attention. These symptoms could indicate a serious condition such as a fracture in the bones around the pterion of the skull, which may lead to the formation of a hematoma due to damage to a major artery. This could cause increased pressure on the brain and potentially be life-threatening. Applying ice to the bruised area might be beneficial for swelling, but it is crucial not to delay seeking medical help. Cleaning the ear with a cotton swab is not advised as it could cause further damage. Pain medication, specifically non-steroidal anti-inflammatory drugs (NSAIDs), should be avoided initially as they can interfere with blood clotting.