Misdiagnosis is common as the warmth, redness, pain is nonspecific for inflammation. 

Consider necrotizing fasciitis when there is:

• Pain out of proporition to exam (POOP)
• Pain outside of erythematous margins (POEM)
• Sepsis without source (SWOS), worsening vital signs
• Cellulitis not responding to antibiotics

MRSA coverage for purulent cellulitis or immunocompromised. 

The return visit failed outpatient treatment for cellulitis when:

• progression of redness after 72h of treatment
• progression of pain after 48h of treatment
• progression of warmth after 48h of treatment

Postpartum Mastitis:

• MSSA coverage mostly - Keflex for example
• continue breastfeeding
• reassure mom regarding no risks to baby