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Cellulitis

Cellulitis At A Glance

  • Cellulitis is a bacterial infection of the deeper layers of skin and the tissue just beneath it.
  • It most often affects the lower leg in adults and may cause warmth, swelling, tenderness, pain, and redness or other skin discoloration.
  • The infection usually begins when bacteria enter through a cut, crack, bite, wound, ulcer, fungal infection, or other break in the skin.
  • Cellulitis usually requires prompt antibiotic treatment because the infection can spread into deeper tissue or the bloodstream.
  • Most mild cases are treated with oral antibiotics, rest, elevation of the affected limb, hydration, and appropriate wound care.
  • Rapidly spreading swelling, severe pain, fever, purple or black skin, confusion, or worsening symptoms despite antibiotics require urgent medical evaluation.

Table of Contents

Table of Contents

What Is Cellulitis?

What Is Cellulitis?

Cellulitis is a bacterial infection of the deeper layers of skin and the tissue just beneath it. It usually causes an area that is warm, swollen, tender, and red or discolored. Adults most often develop it on a lower leg, but it can occur anywhere.

Cellulitis needs prompt antibiotic treatment because infection can spread into deeper tissue or the bloodstream. It is different from cellulite, the harmless dimpled appearance of skin, and from an abscess, which is a pocket of pus that may require drainage.

Learn More

About Cellulitis – CDC
https://www.cdc.gov/group-a-strep/about/cellulitis.html

Explains cellulitis symptoms, diagnosis, antibiotic treatment, recovery, and prevention.

Cellulitis – NIH MedlinePlus
https://medlineplus.gov/ency/article/000855.htm

Provides patient information about symptoms, tests, treatment, hospitalization, and emergency warning signs.

How Common Is Cellulitis?

Cellulitis is a common skin infection. Anyone can develop it, sometimes through a skin opening too small to notice.

Risk and recurrence are higher with leg swelling, lymphedema, athlete’s foot, eczema, ulcers, obesity, diabetes, poor circulation, prior cellulitis, or a weakened immune system.

Learn More

Clinical Guidance for Cellulitis – CDC
https://www.cdc.gov/group-a-strep/hcp/clinical-guidance/cellulitis.html

Reviews causes, testing, antibiotics, complications, elevation, and recurrence prevention.

Preventing Cellulitis From Returning – American Academy of Dermatology
https://www.aad.org/public/diseases/a-z/cellulitis-self-care

Provides wound, skin, athlete’s-foot, swelling, and health-condition prevention advice.

What Symptoms Might You Notice?

  • A painful, warm, tender, swollen area
  • Red, pink, purple, gray, or darker discoloration depending on skin tone
  • Poorly defined edges that may expand
  • Tight, glossy, pitted, or orange-peel-like skin
  • Blisters, leaking fluid, or an open skin break
  • Swollen nearby lymph nodes or red streaking
  • Fever, chills, fatigue, body aches, nausea, or feeling ill

Redness may be less obvious on brown or Black skin; warmth, swelling, pain, texture, and color change from the person’s normal skin remain important.

Learn More

About Cellulitis – CDC
https://www.cdc.gov/group-a-strep/about/cellulitis.html

Explains cellulitis symptoms, diagnosis, antibiotic treatment, recovery, and prevention.

Cellulitis: Signs and Symptoms – American Academy of Dermatology
https://www.aad.org/public/diseases/a-z/cellulitis-symptoms

Shows common skin and whole-body symptoms and signs of severe infection.

How Is Cellulitis Diagnosed?

A clinician examines the skin and asks about timing, spread, pain, fever, wounds, bites, water exposure, procedures, prior infection, medicines, allergies, diabetes, circulation, and immune health.

Many conditions mimic cellulitis, including blood clots, venous stasis dermatitis, gout, contact dermatitis, lymphedema, shingles, abscess, and necrotizing infection. Redness and swelling in both legs is often caused by something other than cellulitis.

Learn More

Clinical Guidance for Cellulitis – CDC
https://www.cdc.gov/group-a-strep/hcp/clinical-guidance/cellulitis.html

Reviews causes, testing, antibiotics, complications, elevation, and recurrence prevention.

Cellulitis infographic – click to enlarge

What Causes Cellulitis?

Streptococcus and Staphylococcus bacteria are common causes. They enter through a cut, crack, ulcer, bite, burn, surgical wound, injection site, fungal infection, or inflamed skin.

  • Athlete’s foot or cracked skin between toes
  • Eczema, psoriasis, ulcers, or chronic wounds
  • Leg swelling, lymphedema, or vein disease
  • Animal or human bites
  • Surgery, trauma, tattoos, piercings, or injected drugs
  • Water-exposed wounds
  • Diabetes, poor circulation, obesity, or immune suppression

Cellulitis is generally not spread through casual contact, although drainage from an open wound can carry germs.

What Can Make Cellulitis Worse?

  • Delaying medical evaluation or antibiotics
  • Stopping antibiotics early or missing doses
  • Squeezing or cutting a suspected abscess
  • Walking or working heavily on a swollen limb
  • Untreated athlete’s foot, eczema, wound, ulcer, or edema
  • Poorly controlled diabetes or immune suppression
  • Using leftover or incorrect antibiotics
  • Ignoring severe pain, rapid spread, fever, purple skin, or confusion

Facial or eye-area infection, bites, water exposure, surgical wounds, and infections near implanted joints or devices need special assessment.

Prevention

  • Clean cuts, scrapes, bites, and burns promptly and cover them until healed.
  • Moisturize dry or cracked skin daily.
  • Treat athlete’s foot, eczema, ulcers, and fungal nail disease.
  • Control leg swelling or lymphedema with a clinician-guided plan.
  • Wear protective shoes, gloves, and clothing for risky activities.
  • Check feet daily if diabetes, neuropathy, or poor circulation is present.
  • Manage blood glucose, weight, circulation, and smoking.
  • Avoid injecting drugs; use sterile harm-reduction supplies if exposure continues.

People with repeated cellulitis should ask about skin care, edema treatment, specialist referral, and whether preventive antibiotics are appropriate.

Learn More

Preventing Cellulitis From Returning – American Academy of Dermatology
https://www.aad.org/public/diseases/a-z/cellulitis-self-care

Provides wound, skin, athlete’s-foot, swelling, and health-condition prevention advice.

Clinical Guidance for Cellulitis – CDC
https://www.cdc.gov/group-a-strep/hcp/clinical-guidance/cellulitis.html

Reviews causes, testing, antibiotics, complications, elevation, and recurrence prevention.

Labs

  • Routine mild cellulitis usually needs no culture.
  • Wound or Pus Culture: Used when drainage or an abscess is present.
  • Blood Tests: CBC, metabolic tests, inflammatory markers, lactate, or blood cultures may be used with severe illness.
  • Special Cultures: Considered after animal bites, water exposure, unusual organisms, or immune suppression.
  • Glucose or A1C: May be checked with diabetes risk or poor healing.

Antibiotic treatment should not be delayed for test results when cellulitis is suspected.

Learn More

Clinical Guidance for Cellulitis – CDC
https://www.cdc.gov/group-a-strep/hcp/clinical-guidance/cellulitis.html

Reviews causes, testing, antibiotics, complications, elevation, and recurrence prevention.

Diagnostics

  • Skin Marking or Measurement: Tracks whether the border expands after treatment begins.
  • Ultrasound: Looks for a hidden abscess or, when appropriate, a blood clot.
  • X-Ray: May identify gas, a foreign body, or bone concern.
  • CT or MRI: Used for deep infection, surgical complications, eye-area infection, or possible necrotizing infection.
  • Biopsy: Rarely used when inflammation, cancer, or another diagnosis is suspected.

A rapidly worsening patient may need urgent surgical assessment even before imaging is completed.

Treatment & Management

Treatment Options

Most mild cellulitis is treated with oral antibiotics active against likely bacteria. Severe infection may require IV antibiotics, hospital care, fluids, monitoring, and specialist or surgical treatment.

  • Antibiotics chosen for infection site, pus, allergies, local resistance, and exposure history
  • Elevation of an affected arm or leg to reduce swelling
  • Rest, appropriate pain control, hydration, and wound care
  • Drainage when a true abscess is present
  • Treatment of athlete’s foot, eczema, ulcers, edema, or another entry point

Cellulitis can look slightly worse during the first day, but it should begin improving within about 24–48 hours. Contact the clinician promptly if it continues spreading or systemic symptoms persist.

Learn More

Cellulitis: Diagnosis and Treatment – American Academy of Dermatology
https://www.aad.org/public/diseases/a-z/cellulitis-treatment

Explains antibiotics, wound care, elevation, expected improvement, and when to call the clinician.

Clinical Guidance for Cellulitis – CDC
https://www.cdc.gov/group-a-strep/hcp/clinical-guidance/cellulitis.html

Reviews causes, testing, antibiotics, complications, elevation, and recurrence prevention.

Lifestyle Changes

  • Elevate the affected limb above heart level when possible.
  • Rest while feverish or significantly swollen.
  • Move nearby joints gently to prevent stiffness unless told otherwise.
  • Avoid tight clothing, shoes, or compression over acute infection until advised.
  • Drink enough fluids unless medically restricted.
  • Stop smoking and support blood-glucose control.
  • Resume work and exercise gradually as pain, swelling, and fever improve.

Do not massage an acutely infected area. Ask when it is safe to restart compression for chronic swelling.

Medications

  • Oral Antibiotic: Often a beta-lactam such as cephalexin for nonpurulent infection; alternatives depend on allergy and circumstances.
  • MRSA-Active Antibiotic: Added or selected when pus, prior MRSA, injection exposure, or other risk is present.
  • IV Antibiotic: Used for severe, rapidly spreading, facial, immune-compromised, or treatment-resistant infection.
  • Pain or Fever Medicine: Acetaminophen or an anti-inflammatory medicine may help when safe.
  • Preventive Antibiotic: Occasionally considered by a specialist for repeated episodes after risk factors are addressed.

Take antibiotics exactly as prescribed. Report allergy symptoms, severe diarrhea, fainting, or other serious effects. Never save or share leftover antibiotics.

Procedures

Cellulitis itself does not contain a drainable pocket. If ultrasound or examination shows an abscess, a clinician may numb and drain it and send pus for culture.

Deep infection, dead tissue, infected hardware, severe bite injury, or necrotizing soft-tissue infection may require emergency surgery. Wounds or ulcers may need cleaning, debridement, or specialized dressings.

What Should You Expect Long-Term?

With prompt treatment, most people recover fully. Pain, warmth, and spread should improve first; swelling and skin discoloration may take longer to resolve.

One episode increases the chance of another, especially when edema, lymphedema, athlete’s foot, ulcers, obesity, or skin disease continues. Repeated episodes can further damage lymph drainage.

Learn More

Cellulitis: Diagnosis and Treatment – American Academy of Dermatology
https://www.aad.org/public/diseases/a-z/cellulitis-treatment

Explains antibiotics, wound care, elevation, expected improvement, and when to call the clinician.

Preventing Cellulitis From Returning – American Academy of Dermatology
https://www.aad.org/public/diseases/a-z/cellulitis-self-care

Provides wound, skin, athlete’s-foot, swelling, and health-condition prevention advice.

What Can You Do At Home?

  • Take every antibiotic dose on time and finish the prescribed course.
  • Draw around the border only if the clinician recommends it; write the date and time.
  • Elevate the area and rest.
  • Keep wounds clean, covered, and dressed as instructed.
  • Wash hands before and after wound care.
  • Do not squeeze blisters, cut the skin, or attempt drainage.
  • Check temperature and monitor pain, spread, streaking, drainage, and alertness.
  • Arrange the recommended follow-up, especially with diabetes, poor circulation, or immune suppression.

Contact the clinician if symptoms are not clearly improving within 24–48 hours or if they worsen at any time.

Frequently Asked Questions

Is cellulitis contagious?

Usually not through casual contact. Cover draining wounds and use good hand hygiene because wound bacteria can spread.

Is cellulitis the same as an abscess?

No. Cellulitis spreads through tissue without a pus pocket; an abscess contains pus and often needs drainage.

Should I mark the redness?

A clinician may recommend marking and dating the edge to track spread. Do not delay care while monitoring it.

Can cellulitis worsen after antibiotics start?

It may look slightly worse during the first day, but ongoing spread, fever, or illness needs prompt reassessment.

Can I use antibiotic cream alone?

No. Cellulitis is deeper than the skin surface and generally needs oral or IV antibiotics.

Can I exercise?

Rest and elevate during acute swelling or fever. Resume gradually after improvement and clinician guidance.

Why does it keep returning?

Common reasons include lymphedema, leg swelling, athlete’s foot, cracked skin, ulcers, obesity, and poorly controlled diabetes.

Do I need a culture?

Not usually for uncomplicated nonpurulent cellulitis. Cultures are more useful with pus, severe illness, bites, water exposure, or immune suppression.

Questions To Ask Your Provider

  • Does this look like cellulitis or a mimic such as a blood clot or dermatitis?
  • Is there an abscess that needs drainage?
  • Which bacteria and exposures need antibiotic coverage?
  • How long should I take the antibiotic?
  • When should improvement begin?
  • Should I mark the border or return for a recheck?
  • When may I restart compression, work, or exercise?
  • How should I treat the wound, athlete’s foot, eczema, ulcer, or swelling?
  • Do recurrent episodes require specialist care or preventive antibiotics?
  • Which symptoms mean I should go to the emergency department?

Specialist Referrals

  • Emergency Department: Severe illness, rapid spread, face or eye involvement, treatment failure, or high-risk medical conditions.
  • Infectious Disease Specialist: Resistant, recurrent, unusual, immune-compromised, bone, bloodstream, or device-associated infection.
  • Surgeon: Abscess, necrotizing infection, dead tissue, infected hardware, or complex wound.
  • Dermatologist: Unclear diagnosis, recurrent inflammation, eczema, ulcers, or a cellulitis mimic.
  • Wound or Vascular Specialist: Chronic ulcer, poor circulation, or difficult healing.
  • Lymphedema Therapist: Persistent swelling after acute infection is controlled.

Is Cellulitis Curable?

Yes. Most cellulitis clears with the correct antibiotic and supportive care. Severe or delayed cases can still be treated but may need hospitalization or surgery.

A cured episode can recur. Protecting skin and treating swelling, fungal infection, wounds, and chronic disease lowers the risk.

Emergency Symptoms / When To Seek Immediate Help

  • Rapidly spreading swelling or discoloration
  • Severe pain, pain out of proportion, numbness, or skin that turns purple, gray, or black
  • Fever with shaking chills, fast heartbeat, fast breathing, dizziness, or fainting
  • Confusion, unusual sleepiness, cold clammy skin, or very low urine output
  • Blisters, skin peeling, red streaks, or pus with worsening illness
  • Swelling around an eye, pain with eye movement, vision change, or a bulging eye
  • Facial or neck swelling with trouble breathing or swallowing
  • Worsening despite antibiotics, especially with diabetes, poor circulation, or immune suppression

Call emergency services for confusion, collapse, breathing difficulty, signs of shock, or suspected sepsis. Severe pain and rapid skin change can signal necrotizing infection and require emergency surgery.

Learn More

Cellulitis – NIH MedlinePlus
https://medlineplus.gov/ency/article/000855.htm

Provides patient information about symptoms, tests, treatment, hospitalization, and emergency warning signs.

Cellulitis: Signs and Symptoms – American Academy of Dermatology
https://www.aad.org/public/diseases/a-z/cellulitis-symptoms

Shows common skin and whole-body symptoms and signs of severe infection.

CALL 911

APNS does not provide emergency medical services. If you believe you are experiencing a medical emergency, including (but not limited to) chest pain, difficulty breathing, stroke symptoms, severe allergic reactions, anaphylaxis, uncontrolled bleeding, seizures, loss of consciousness, or any other potentially life-threatening condition, you are instructed to call 911 immediately or go immediately to the nearest emergency department.

Official Resources / External Links

About Cellulitis – CDC
https://www.cdc.gov/group-a-strep/about/cellulitis.html

Explains cellulitis symptoms, diagnosis, antibiotic treatment, recovery, and prevention.

Clinical Guidance for Cellulitis – CDC
https://www.cdc.gov/group-a-strep/hcp/clinical-guidance/cellulitis.html

Reviews causes, testing, antibiotics, complications, elevation, and recurrence prevention.

Cellulitis – NIH MedlinePlus
https://medlineplus.gov/ency/article/000855.htm

Provides patient information about symptoms, tests, treatment, hospitalization, and emergency warning signs.

Cellulitis: Diagnosis and Treatment – American Academy of Dermatology
https://www.aad.org/public/diseases/a-z/cellulitis-treatment

Explains antibiotics, wound care, elevation, expected improvement, and when to call the clinician.

Cellulitis: Signs and Symptoms – American Academy of Dermatology
https://www.aad.org/public/diseases/a-z/cellulitis-symptoms

Shows common skin and whole-body symptoms and signs of severe infection.

Preventing Cellulitis From Returning – American Academy of Dermatology
https://www.aad.org/public/diseases/a-z/cellulitis-self-care

Provides wound, skin, athlete’s-foot, swelling, and health-condition prevention advice.

This guide is educational and does not replace professional medical care. Cellulitis requires prompt evaluation and usually antibiotics. Seek emergency help for rapid spread, severe pain, purple or black skin, confusion, fainting, breathing trouble, eye involvement, or signs of sepsis. Do not use leftover antibiotics or attempt to drain the area at home.

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