1. Periorbital orbital cellulitis
    Periorbital cellulitis is an infection that affects the eyelid and the surrounding area. It can cause marked swelling and skin discoloration in the affected area. Although it can affect anyone, the condition is most common in children. Periorbital cellulitis is treatable with antibiotics.
    www.medicalnewstoday.com/articles/periorbital-ce…
    Periorbital orbital cellulitis
    Periorbital (or preseptal) cellulitis, is an infective oedema of the eyelids and periorbital skin with no involvement of the orbit. Periorbital cellulitis is usually caused by Staphylococcus, streptococcus or Haemophilus bacteriae (more likely in unimmunised children). Periorbital cellulitis can follow a minor injury to the eye.
    kingstonhospital.nhs.uk/healthcare-professionals/p…
    Periorbital orbital cellulitis
    Preseptal and orbital cellulitis are infections of the soft tissues in the socket that surrounds the eye, usually caused by common bacteria. They may follow a cold, sinusitis, an infection of the eyelid such as a stye, an infection of the tear drainage channels, or injury or recent surgery near the eye.
    www.college-optometrists.org/clinical-guidance/cli…
    Periorbital orbital cellulitis

    Peri-orbital cellulitis is an infection anterior to the orbital septum. It is less severe than orbital cellulitis. Peri-orbital cellulitis is usually caused by contiguous spread from facial or eyelid injury, a chalazion, insect bite, or conjunctivitis but can be caused by sinusitis.

    geekymedics.com/orbital-and-periorbital-cellulitis/
     
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  7. Differential Diagnosis of the Swollen Red Eyelid - AAFP

    WEBJul 15, 2015 · A mass within the midportion of the lid is commonly a chalazion. Preseptal and orbital cellulitis are important to identify, treat, and differentiate from each other.