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    Skin infection - bacterial

    Cellulitis is a common skin infection caused by bacteria.


    Staphylococcus and streptococcus bacteria are the most common causes of cellulitis.

    Normal skin has many types of bacteria living on it. When there is a break in the skin, these bacteria can cause a skin infection. Skin in the infected area will become red, hot, irritated, swollen,and painful.

    Risk factors for cellulitis include:

    • Cracks or peeling skin between the toes
    • History of peripheral vascular disease
    • Injury or trauma with a break in the skin (skin wounds)
    • Insect bites and stings, animal bites, or human bites
    • Ulcers from certain diseases, including diabetes and vascular disease
    • Use of corticosteroid medications or medications that suppress the immune system
    • Wound from a recent surgery


    Symptoms of cellulitis include:

    • Fever
    • Pain or tenderness in the affected area
    • Skin redness or inflammation that gets bigger as the infection spreads
    • Skin sore or rash that starts suddenly, and grows quickly in the first 24 hours
    • Tight, glossy, stretched appearance of the skin
    • Warm skin in the area of redness

    Signs of infection:

    • Chills or shaking
    • Fatigue
    • General ill feeling
    • Muscle aches and pains
    • Warm skin
    • Sweating

    Other symptoms that can occur with this disease:

    • Hair loss at the site of infection
    • Joint stiffness caused by swelling of the tissue over the joint
    • Nausea and vomiting

    Exams and Tests

    The health care provider will perform a physical exam. This may reveal:

    • Redness, warmth, and swelling of the skin
    • Possible drainage, if there is an infection
    • Swollen glands (lymph nodes) near the affected area

    Your health care provider may mark the edges of the redness with a pen, to see if the redness goes past the marked border over the next several days.

    Tests that may be ordered include:

    • Blood culture
    • Complete blood count (CBC)
    • Culture of any fluid or material inside the affected area


    You will likely be prescribed antibiotics to betaken by mouth. You may be given pain medicine as well.

    At home, raise the infected area higher than your heart to reduce swelling. Rest until your symptoms improve.

    You may need to stay in a hospital if:

    • You are very sick (for example, you have a very high temperature, blood pressure problems, or nausea and vomiting that does not go away)
    • You have been on antibiotics and the infection is getting worse
    • Your immune system is not working well (due to cancer, HIV)
    • You have an infection around your eyes
    • You require antibiotics through a vein (IV)

    Outlook (Prognosis)

    Cellulitis usually goes away after taking antibiotics for 7to 10 days. Longer treatment may be needed if cellulitis is more severe. This may occur if you have a chronic diseases or your immune system is not working properly.

    People with fungal infections of the feet may have cellulitis that keeps coming back. Cracks in the skin from the fungal infection allows the bacteria to get into the skin.

    Possible Complications

    • Blood infection (sepsis)
    • Bone infection (osteomyelitis)
    • Inflammation of the lymph vessels (lymphangitis)
    • Inflammation of the heart (endocarditis)
    • Meningitis
    • Shock
    • Tissue death (gangrene)

    When to Contact a Medical Professional

    Call your health care provider if:

    • You have symptoms of cellulitis
    • You are being treated for cellulitis and you develop new symptoms, such as persistent fever, drowsiness, lethargy, blistering over the cellulitis, or red streaks that spread

    Seek medical attention right away if the cellulitis is on your face.


    Protect your skin by:

    • Keeping your skin moist with lotions or ointments to prevent cracking
    • Wearing shoes that fit well and provide enough room for your feet
    • Learning how to trim your nails to avoid harming the skin around them
    • Wearing appropriate protective equipment when participating in work or sports

    Whenever you have a break in the skin:

    • Clean the break carefully with soap and water. Apply an antibiotic cream or ointment every day.
    • Cover with a bandage and change it every day until a scab forms.
    • Watch for redness, pain, drainage, or other signs of infection.


    Habif TP. Clinical Dermatology: A Color Guide to Diagnosis and Therapy. 5th ed. Philadelphia, Pa.: Elsevier Mosby; 2009; chap 9.

    Kaplan AP. Urticaria and angioedema. In: Adkinson NF Jr., Bochner BS, Busse WW, et al., eds. In: Middleton’s Allergy Principles and Practice. 7th ed. Philadelphia, Pa.: Elsevier Mosby; 2008:chap 61.


    • Cellulitis


    • Cellulitis on the arm


      • Cellulitis


      • Cellulitis on the arm


      Tests for Cellulitis

        Review Date: 5/15/2013

        Reviewed By: Kevin Berman, MD, PhD, Atlanta Center for Dermatologic Disease, Atlanta, GA. Review provided by VeriMed Healthcare Network. Also reviewed by David Zieve, MD, MHA, Medical Director, A.D.A.M., Inc.

        The information provided herein should not be used during any medical emergency or for the diagnosis or treatment of any medical condition. A licensed medical professional should be consulted for diagnosis and treatment of any and all medical conditions. Links to other sites are provided for information only -- they do not constitute endorsements of those other sites. © 1997- A.D.A.M., Inc. Any duplication or distribution of the information contained herein is strictly prohibited.

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