Diagnosis is clinical
Consider labs, blood culture if patient is immunocompromised, risk factors, renal dysfunction
Bedside ultrasound to identify abscess
CT can identify deep, extensive infection that involve soft tissues of neck or pharynx
Facial cellulitis
Infectious
Blepharitis
Cellulitis
Periorbital cellulitis
Impetigo
Orbital cellulitis
Erysipelas