Hi..thanks for your query.
The first thing that anyone would like to rule out in such a case is a fracture
of the underlying bones.But, this unfortunately is not possible till you visit a doctor.
You can start with oral anti inflammatory /analgesic
medication.This should be available OTC in most countries.You can take it for 2-3 days and see how much of a reduction in the swelling you have.If persistent, it is definitely required to rule out any underlying injury
.Do not massage
or touch the concerned area at all.
hope this helps.Take care!