Periorbital cellulitis is an infection of the eyelid and area around the eye; orbital cellulitis is an infection of the eyeball and tissues around it.

Periorbital and orbital cellulitis are infections that most often occur in young children. The septum is a membrane that separates the front part of the eye from the back part of the eye. Periorbital cellulitis is also called preseptal cellulitis because it affects the structures in front of the septum, such as the eyelid and skin around the eye. Orbital cellulitis involves the eyeball itself, the fat around it, and the nerves that go to the eye. Both of these infections can be caused by bacteria that normally live on the skin or by other bacteria.

Periorbital cellulitis often occurs from a scratch or insect bite around the eye that leads to infection of the skin. Symptoms can include swelling, redness, pain, and tenderness to touch occurring around one eye only. The affected person is able to move the eye in all directions without pain, but there can be difficulty opening the eyelid, often due to swelling. Vision is normal.

眼周蜂窝织炎是眼睑和眼周围区域的感染；眼眶蜂窝织炎是眼球及其周围组织的感染。

眶周和眼眶蜂窝组织炎是最常见于幼儿的感染。的隔膜是分割眼睛从眼睛的后部的前部的膜。眶周蜂窝组织炎也称为前房膜蜂窝组织炎，因为它会影响隔膜前部的结构，例如眼睑和眼睛周围的皮肤。眼眶蜂窝织炎涉及眼球本身，眼球周围的脂肪以及进入眼睛的神经。这两种感染都可以由通常生活在皮肤上的细菌或其他细菌引起。

眼周蜂窝组织炎通常是由于眼睛周围的划痕或虫咬引起，导致皮肤感染。症状可能包括只在一只眼睛周围发生肿胀，发红，疼痛和触痛。受影响的人可以使眼睛向各个方向移动，而不会感到疼痛，但是由于肿胀，可能很难睁开眼睑。视力正常。