Which condition is Topical Azithromycin commonly used to treat?

Topical Azithromycin is commonly used to treat blepharitis, which is an inflammation of the eyelid margins often associated with bacterial infections or seborrheic dermatitis. The medication works as a macrolide antibiotic, effectively targeting bacterial pathogens and reducing inflammation in the affected area. In this case, when applied topically to the eyelids, Azithromycin can help alleviate symptoms and manage the underlying infection or irritation.

In the context of the other conditions listed, while Azithromycin may have systemic or alternative routes of administration for other infections, it is specifically through its topical formulation that it becomes especially beneficial for treating blepharitis. Sinusitis, otitis media, and chickenpox do not commonly warrant the use of topical Azithromycin since they involve deeper or systemic infections typically treated with different antibiotics or antiviral therapies.