What causes localized redness on the white part of my eye with mild itching and tearing?

Localized redness on the white part of your eye, especially if associated with mild itching and tearing, might be due to several reasons. A common cause is conjunctivitis, which can be allergic, viral, or bacterial in origin. Given your symptoms of mild itching and tearing with normal vision, allergic conjunctivitis seems probable, especially if you have a history of allergies or recent exposure to potential allergens such as pollen or pet dander. Viral conjunctivitis, often associated with a cold or respiratory infection, could also present similar symptoms but typically involves more watery discharge and possibly affects both eyes. Bacterial conjunctivitis usually presents more severely with purulent discharge, which doesn’t seem applicable in your case. Another possibility is dry eye syndrome; although it typically causes more generalized discomfort, it can manifest as localized redness with itching. Environmental factors like prolonged screen time or exposure to wind can exacerbate these symptoms. For management, try using artificial tears to see if it provides any relief, as they can help in washing away irritants and providing lubrication. It’s also worth minimizing exposure to known allergens and consider using antihistamine eye drops if allergies are suspected. However, if the redness persists, if you notice any pain, significant changes in vision, or if the symptoms spread, it’s important to see an eye care professional promptly. They can conduct a thorough examination and rule out other causes such as episcleritis, subconjunctival hemorrhage not initially apparent, or even more serious conditions like viral keratitis. Never ignore eye symptoms that are not improving, as timely evaluation is key to preventing complications.