I would like to explain the medical term of black eye first.A black eye is a relatively common result of injury to the face or the head, caused when blood and other fluids collect in the space around the eye; swelling and dark discoloration result-hence, the name "black eye."
A blunt injury
to the nose often causes both eyes to swell because the swelling from the nasal injury
causes fluid to collect in the loose tissues of the eyelids.
For simple, uncomplicated black eyes, the treatment is symptomatic.( home treatment) , you can give some pain killers for pain management.How ever darkness around the eyes will disappear within 7 days .no need to be panic and do unnecessary intervention.Hope you get the answer