A 3-year-old child with localized swelling of the upper eyelid and tearing but no pain or discharge is most consistent with which condition?

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Chalazion describes a localized, painless lump in the eyelid caused by blockage of a meibomian gland with a granulomatous reaction. It tends to be a firm, non-tender swelling on the eyelid that enlarges slowly. Tearing can occur due to irritation, but there is typically no eye discharge or conjunctival redness. This fits the child’s presentation: upper eyelid swelling with tearing, but no pain or discharge.

In contrast, conjunctivitis usually presents with a red eye and discharge (and sometimes itching), blepharitis causes lid margin inflammation with crusting and flaking, and a stye (acute hordeolum) is a painful, tender lump near the lash line often with purulent discharge. Therefore, the described picture most aligns with a chalazion. Management generally involves warm compresses and lid hygiene, with referral if it persists or affects vision.