If he sprained his ankle and you know he's n pain, then you should see the doctor or make an appointment. If the injury is severe then take him or her to the emergency room.
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unintentional injury and homicide were the 2nd leading cause of death for people aged 15 to 24
If you’ve tried to get rid of it using a lot of medicines, your best bet is to just get a doctor to freeze it off. Its not painful, its quick and pretty cheap. Just try that, you’ve probably lost more money buying medicine by now.
I'd say its overuse injury (muscle injury) but do you have choices to choose from?