The orbital septum is a thin fibrous membrane that separates the preseptal soft tissue from the postseptal orbital contents.
The septum begins at the orbital rim, where it attaches directly to the periosteum at a thickened ridge called the arcus marginalis. This natural barrier is vital for prevention of infection and anterior preseptal surface lesions from entering the orbit. Preseptal cellulitis is often noted after lid infections and superficial lid trauma. Unusually, insect bites can also cause eyelid cellulitis and subsequent lid abscess. In this column, we present a case of insect