One eye is swollen, it is likely to be caused by local reasons, the most common is local trauma, inflammation, or allergies, eye lesions appear eye swelling, need to be treated as follows: 1, trauma: need to actively do trauma treatment; 2, inflammation: especially cellulitis, need to apply antipathogenic microorganisms to the treatment; 3, eye lesions: need to distinguish between the eye lesions which lesions, whether infectious lesions, traumatic lesions, or immune lesions It’s an infectious lesion, a traumatic lesion, or an immunologic lesion. So one eye swelling need to distinguish between different situations, and different situations are not the same way to deal with, not because only one eye swelling and relax vigilance.