Management of Cellulitis

Indications for Hospitalization

The Infectious Diseases Society of America recommends hospitalization for patients with cellulitis who present with signs of systemic inflammatory response syndrome (SIRS), hemodynamic instability, altered mental status, suspicion of deep necrotizing infection, severe immunosuppression, or failure of outpatient treatment 1, 2
Hospitalization is indicated for patients with absolute criteria such as presence of SIRS, hemodynamic instability, or altered mental status 1, 2, 3
Relative indications for hospitalization include severe immunosuppression, poor anticipated adherence to outpatient treatment, or inability to follow up within 48-72 hours 1, 2, 5
The American College of Clinical Pharmacy suggests considering hospitalization for patients with extensive cellulitis (>5 cm from the wound edge) or those with rapidly progressing erythema 4

The presence of local characteristics such as rapid extension of erythema, severe pain, or lymphangitis is concerning for severe disease 1, 2, 3
Systemic factors such as fever, leukocytosis, or elevated inflammatory markers (e.g., C-reactive protein or erythrocyte sedimentation rate) also indicate severe disease 1, 2, 5
Patients with significant comorbidities, such as poorly controlled diabetes or peripheral arterial disease, may require hospitalization for moderate infections 5

Complicated foliculitis may require surgical drainage of deep abscesses or management of underlying hidradenitis suppurativa 1, 2
Colonization with methicillin-resistant Staphylococcus aureus (MRSA) may require specific antibiotic coverage, especially in the presence of purulent drainage 1, 2, 4

Failing to recognize early signs of necrotizing infection, such as severe pain, crepitus, or necrotic skin, which requires urgent surgical evaluation 3
Underestimating disease severity in immunosuppressed patients, who may not mount a robust inflammatory response but still have severe infection 1, 2, 5
Failing to ensure adequate follow-up, as outpatient treatment can silently fail without reevaluation within 48-72 hours 1, 2
Ignoring risk factors for MRSA, such as purulent drainage, intravenous drug use, or known colonization, which requires empirical MRSA coverage 1, 2, 4