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Blepharitis typically presents with symptoms that are bilateral, meaning it affects both eyelids, and relapsing in nature. This condition arises from inflammation of the eyelid margins, most often due to seborrheic dermatitis, staphylococcal infection, or meibomian gland dysfunction. Patients may experience redness, itching, burning, and crusting along the eyelid margins, and these symptoms can improve or worsen over time, indicating a relapsing pattern.

The bilateral aspect of blepharitis is significant because it often affects both eyelids simultaneously due to the nature of the inflammatory process, which is typically systemic rather than localized to one side. The relapsing tendency is also crucial; many patients with blepharitis experience periods of improvement followed by flare-ups, influenced by factors such as environmental irritants or inadequate eyelid hygiene.

In contrast, sudden and severe onset would be more characteristic of an acutely infected or traumatic eyelid rather than blepharitis, which has more gradual and cyclical symptom patterns. Unilateral symptoms could suggest a localized condition like a stye, and constantly worsening symptoms over weeks may indicate a more serious underlying condition requiring further investigation. Therefore, the characteristic presentation aligning with bilateral and