Differential Diagnosis of Cellulitis
Stasis dermatitis
- Bilateral leg involvement; circumferential erythema and swelling; usually no fevers
- 雙腿；周圍紅斑和腫脹;通常不發燒
Contact dermatitis
- Unusual patterns of distribution; pruritus; no fevers
Inflammatory arthritis
Erythema overlies a joint; pain with range of motion
Deep venous thrombosis/ thrombophlebitis
Deep pain in calf; linear venous cord; usually no fevers
Hypersensitivity/drug reaction
- History of medication, allergen, insect bite exposure; erythema doesn’t spread as fast as cellulitis
- 用藥史、過敏原、昆蟲叮咬史；紅斑的傳播速度不如蜂窩織炎
Pyoderma gangrenosum
- Nodular, bullous, ulcerated lesions; usually on anterior shin; often associated with inflammatory bowel disease or collagen vascular syndromes
- 結節性，大皰性，潰瘍性病變；
- 通常在前脛骨上；通常與ulcerative colitis 或collagen vasuclar syndrome
Erythema migrans (Lyme disease)
Well-demarcated erythema; annular; usually not painful; slow-growing