I have puffy eyelid (upper) for past 2 days on my both eyes, the right one more. it does not itch, burn or anything else. it's just there. i have used pataday and took antihistamine.?

Sounds like allergy.: Puffy eyelid without any other symptoms could be allergic reaction to something in food, medication, environment etch... Pataday drops is used for allergic conjunctivitis and antihistamine is best choice to take for such reaction. You did right think. You can also use cold gentle compress and if symptoms do not resolve than consult your primary physician.

Likely Will Clear: Sounds like a localized edema or fluid collection in the tissue. Allergy or sensitivity reactions may still be involved. Can try cool compresses first and see if any symptoms or changes follow. If not improving, see your primary doctor or ophthalmologist.