It seems from the history that you had a bump on the white part of the eye, for which you are on treatment by tobramycin dexamethasone
eye drops which is a combination of antibiotic and steroid.
The swelling is non infective but antiinflammatory for which your eye doctor has started antibiotic with steroid eye drops. The lesion can be episcleritis
or phylectunular conjunctivitis
or inflammed pterygium.
I advice you to continue the same treatment as advised by your eye doctor.