Periorbital cellulitis is an infection of the soft tissue superficial to the orbital septum.
It is predominantly a pediatric disorder. Periorbital cellulitis occurs secondary to focal infection, trauma, sinusitis, or seeding of periorbital tissue during bacteremia. Blepharitis is an infection that involves the lid margins. It usually is a chronic infection with acute exacerbations extending over many years. Blepharitis is associated with rosacea and seborrheic dermatitis.