Coverage for Gram negative organisms is unnecessary except in very specific patient populations.
Chronic liver disease
Solid organ transplant
Animal and human bites
Pusedocellulitis decribes a multitude of conditions that mimic cellulitis but are not infectious and do not require antibiotics.
Common Causes of Pseudocellulitis:
Bilateral cellulitis is extremely rare and is almost always a misdiagnosis with non-infectious stasis dermatitis.