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It seems the insect has either stinged in the eye or it has been rubbed to release an allergic reaction
Eye is a very delicate organ and may get damaged very soon if neglected. So you should go to ER as soon as possible.
You would need a thorough cleaning of the eye with saline and then local eye drops and may be systemic antibiotics, antihistamine and steroids
also depending upon the local condition.
Early treatment can ensure a good outcome.
I hope the advise would be informative and useful for you.