Our expert says:
Is the swelling red in colour? If it is, it might indicate the formation of a stye, which is infection of a hair follicle and the skin. It is also possible that you have allergies. You will have to consult a doctor for a diagnosis. In the interim, you can use Spersallerg eye drops in combination with an antihistamine, like Zyrtec. This is available over the counter.
Refer to following link about styes: http://en.wikipedia.org/wiki/Stye
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