👤 By the CinnaRN Clinical Content Team🕐 Updated 2026-08-23🏷️ Physiological Adaptation🔖 Free to read, print, and share
Also known as: skin infection · soft tissue infection · red leg infection · cellulitis
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Use this quick-reference guide to spot, treat, and prevent Cellulitis on the NCLEX. Keep it handy during review and on exam day!
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📒 The 1-minute cheat sheet
🩺 Signs
Red, warm, swollen, tender
Poorly demarcated borders
Fever, malaise possible
⚠️ Cause
Strep, Staph via skin break
Risk: diabetes, edema, IVDU
✅ Do
Antibiotics, elevate limb
Mark border, warm compress
🚩 Report
Spreading past mark → notify
Crepitus/necrosis → sepsis risk
📚 Cellulitis — full study notes
The cheat sheet above is your quick recall card. These notes go deeper — what it is, what to do first, what must be reported, and what to teach.
Cellulitis is a bacterial infection of the dermis and subcutaneous tissue, most often caused by Streptococcus or Staphylococcus (including MRSA) entering through a break in the skin. It produces a spreading area of redness, warmth, swelling, and tenderness, usually on the lower legs. People with diabetes, edema, venous insufficiency, or immunosuppression are at higher risk. Untreated, it can progress to abscess, sepsis, or necrotizing fasciitis.
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Key points
Understand these first
Classic signs are localized redness with poorly defined borders, warmth, swelling, pain, and sometimes fever.
The infection commonly follows a cut, insect bite, athlete's foot, ulcer, or surgical wound.
Lymphangitis may appear as red streaking moving toward regional lymph nodes.
Diabetes, peripheral vascular disease, lymphedema, and immunosuppression increase risk and severity.
Systemic spread can cause fever, chills, tachycardia, and progression to sepsis.
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Nursing priorities
What to do, in order
Administer prescribed antibiotics promptly and on schedule; expect IV antibiotics for severe or systemic cases.
Mark the borders of redness with a skin marker and date it to monitor whether the infection is spreading.
Elevate the affected extremity and apply warm compresses to reduce edema and promote drainage.
Assess and document vital signs, pain, and the size and color of the affected area each shift.
Promote rest, hydration, and analgesia, and monitor blood glucose closely in diabetic patients.
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Red flags — report now
Escalate immediately
Rapidly spreading redness, severe pain out of proportion, blistering, crepitus, or dusky skin suggests necrotizing fasciitis; emergency.
Fever, hypotension, confusion, or tachycardia may indicate sepsis; escalate immediately.
Red streaking toward the trunk (lymphangitis) signals worsening infection; notify the provider.
Never massage the inflamed area or apply ice, which can worsen tissue damage.
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Labs & values
Numbers to know
WBC: elevated with infection (normal 5,000 to 10,000/mm3)
Blood cultures: identify organism if systemic spread suspected
C-reactive protein: elevated with inflammation
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Patient teaching
What patients must know
Complete the full course of antibiotics even after symptoms improve.
Keep skin clean, treat cuts and athlete's foot promptly, and moisturize to prevent cracks.
Elevate the limb, and return if redness spreads, fever develops, or pain worsens.
❓ Cellulitis: NCLEX FAQs
What are the priority nursing interventions for Cellulitis?
Administer prescribed antibiotics promptly and on schedule; expect IV antibiotics for severe or systemic cases. Mark the borders of redness with a skin marker and date it to monitor whether the infection is spreading. Elevate the affected extremity and apply warm compresses to reduce edema and promote drainage. Assess and document vital signs, pain, and the size and color of the affected area each shift.
What are the warning signs of Cellulitis a nurse must report?
Rapidly spreading redness, severe pain out of proportion, blistering, crepitus, or dusky skin suggests necrotizing fasciitis; emergency. Fever, hypotension, confusion, or tachycardia may indicate sepsis; escalate immediately. Red streaking toward the trunk (lymphangitis) signals worsening infection; notify the provider. Never massage the inflamed area or apply ice, which can worsen tissue damage.
What do I need to know about Cellulitis for the NCLEX?
Classic signs are localized redness with poorly defined borders, warmth, swelling, pain, and sometimes fever. The infection commonly follows a cut, insect bite, athlete's foot, ulcer, or surgical wound. Lymphangitis may appear as red streaking moving toward regional lymph nodes. Diabetes, peripheral vascular disease, lymphedema, and immunosuppression increase risk and severity.
What patient teaching is important for Cellulitis?
Complete the full course of antibiotics even after symptoms improve. Keep skin clean, treat cuts and athlete's foot promptly, and moisturize to prevent cracks. Elevate the limb, and return if redness spreads, fever develops, or pain worsens.
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Quick Tip
Classic signs are localized redness with poorly defined borders, warmth, swelling, pain, and sometimes fever.