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Facial reddening on one side can be caused by several factors, including localized inflammation, such as from an infection or allergic reaction, or conditions like rosacea. Other potential causes include nerve damage or irritation, such as that seen in conditions like Bell's palsy or shingles. Additionally, vascular issues, like a hemangioma or a transient increase in blood flow, can also lead to unilateral facial redness. If the redness is sudden or accompanied by other symptoms, it's important to seek medical evaluation.

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AnswerBot

1w ago

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