What might cause numbness under my eye on the left side of my face?

Numbness under the eye is often related to the nerves supplying sensation to that area, particularly branches of the trigeminal nerve. Possible causes include:

Nerve irritation or compression: Pressure from swelling, injury, or muscle tension can cause numbness. Sinus infections or allergies: Inflammation in the sinuses near the eye may cause numbness or tingling in adjacent areas. Shingles (herpes zoster): A viral infection that can cause numbness or tingling before a rash appears. Migraine aura: Some migraines cause numbness or tingling on one side of the face. Bell’s palsy: This condition can cause facial numbness or weakness. More serious causes: Stroke or multiple sclerosis (MS) can cause numbness and require urgent medical evaluation. If numbness lasts more than a few days, worsens, or is accompanied by other symptoms such as weakness, vision changes, or difficulty speaking, seek medical care promptly.