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Illustration cross-section of the skin and where cellulitis occurs.

What is cellulitis?

Cellulitis is a bacterial infection of the skin and tissues beneath the skin. Unlike impetigo, which is a very superficial skin infection, cellulitis is a bacterial skin infection that also involves the skin's deeper layers: the dermis and subcutaneous tissue.

The main bacteria responsible for cellulitis are Streptococcus and Staphylococcus ("staph"), the same bacteria that can cause impetigo and other diseases. MRSA (methicillin-resistant Staph aureus) can also cause cellulitis. Sometimes, other bacteria (for example, Hemophilus influenzae, Pneumococcus, and Clostridium species) may cause cellulitis as well.

Cellulitis is fairly common and affects people of all races and ages. Men and women appear to be equally affected. Although cellulitis can occur in ciprofloxacin people of any age, it is most common in middle-aged and elderly people. Cellulitis is not contagious.

This illustration shows the signs and symptoms of cellulitis.

What are cellulitis symptoms and signs?

Cellulitis has characteristic symptoms and signs. Symptoms usually begins as a small area of tenderness, swelling, and redness that spreads to adjacent skin. The involved skin may feel warm to the touch. As this red area begins to enlarge, the affected person may develop a fever, sometimes with chills and sweats, pain, and swollen lymph nodes ("swollen glands") near the area of infected skin.

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This illustration shows the most common sites for cellulitis.

Where does cellulitis occur?

Cellulitis may occur anywhere on the body; the legs are a common location. The lower leg is the most common site of the infection (particularly in the area of the tibia or shinbone and in the foot; see the illustration below), followed by the arm, and then the head and neck areas. In special circumstances, such as following surgery or trauma wounds, cellulitis can develop in the abdomen or chest areas. People with morbid obesity can also develop cellulitis in the abdominal skin. Special types of cellulitis are sometimes designated by the location of the infection. Examples include periorbital and orbital cellulitis (around the eye socket), buccal (cheek) cellulitis, facial cellulitis, and perianal cellulitis.

Cellulitis on the left leg of a male with microscopic images of normal skin over the right leg and deeper subcutaneous tissue involved in a case of cellulitis on the left leg.

What does cellulitis look like?

The signs of cellulitis include redness, warmth, swelling, tenderness, and pain in the involved tissues. Any skin wound or ulcer that produces these symptoms or signs may be developing cellulitis.

Other forms of noninfectious inflammation may mimic cellulitis. People with poor circulation in the legs, for instance, often develop scaly redness on the shins and ankles; this is called "stasis dermatitis" and is often mistaken for the bacterial infection of cellulitis.

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1. Close-up of an open wound on the back of a person's heel along with very dry cracked skin. 2. Patient with cellulitis on the ankle. 3. Abscess and associated cellulitis caused by community-acquired methicillin-resistant Staphylococcus aureus (CA-MRSA).

What are cellulitis risk factors?

Most commonly, cellulitis develops in the area of a break in the skin, such as a cut, small puncture wound, or insect bite. In some cases when cellulitis develops without an apparent skin injury, it may be due to microscopic cracks in the skin that are inflamed or irritated. It may also appear in the skin near ulcers or surgical wounds.

In other circumstances, cellulitis occurs where there has been no skin break at all, such as with chronic leg swelling (edema). A preexisting skin infection, such as athlete's foot (tinea pedis) or impetigo can be a risk factor for the development of cellulitis. Likewise, inflammatory medical conditions or diseases of the skin such as eczema, psoriasis, or skin damage caused by radiation therapy can lead to cellulitis.

People who have diabetes or diseases that compromise the function of the immune system (for example, HIV/AIDS or those receiving chemotherapy or drugs that suppress the immune system) are particularly prone to developing cellulitis.

Conditions or diseases that reduce the circulation of blood in the veins or that reduce circulation of the lymphatic fluid (such as venous insufficiency, obesity, pregnancy, or surgeries) also increase the risk of developing cellulitis.

Microscopic images of strep (Streptococcus) and staph (Staphylococcus) bacteria.

What causes cellulitis? Is cellulitis contagious?

The majority of cellulitis infections are caused by infection with either strep (Streptococcus) or staph (Staphylococcus) bacteria.

The most common bacteria that cause cellulitis are beta-hemolytic streptococci (groups A, B, C, G, and F). A form of rather superficial cellulitis caused by strep is called erysipelas and is characterized by spreading hot, bright red circumscribed area on the skin with a sharp, raised border. Erysipelas is more common in young children. The so-called "flesh-eating bacteria" are, in fact, also a strain of strep bacteria that can sometimes rapidly destroy deeper tissues underneath the skin. Fasciitis is the term used to refer to inflammation of the very deep lining tissues called fascia. The streptococcal infection known as flesh-eating bacterial infection is an example of fasciitis. Cellulitis, when untreated, may rarely spread to the deeper tissues and cause serious fasciitis.

Staph (Staphylococcus aureus), including methicillin-resistant strains (MRSA), is another common type of bacteria that causes cellulitis. There is a growing incidence of community-acquired infections due to methicillin-resistant S. aureus (MRSA), a particularly dangerous type of staph infection that is resistant to many antibiotics, including methicillin, and is therefore more difficult to treat.

Cellulitis can be caused by many other types of bacteria. In children under 6 years of age, H. flu (Hemophilus influenzae) bacteria can cause cellulitis, especially on the face, arms, and upper torso. Cellulitis from a dog or cat bite or scratch may be caused by the Pasteurella multocida bacteria, which has a very short incubation period of only four to 24 hours. Aeromonas hydrophilia, Vibrio vulnificus, and other bacteria are causes of cellulitis that develops after exposure to freshwater or seawater. Pseudomonas aeruginosa is another type of bacteria that can cause cellulitis, typically after a puncture wound.

Cellulitis is not contagious because it is a soft tissue infection of the skin's deeper layers (the dermis and subcutaneous tissue), and the skin's top layer (the epidermis) provides a cover over the infection. In this regard, cellulitis is different from impetigo, in which there is a very superficial skin infection that can be contagious.

A doctor explains a medication to a patient.

What types of health care professionals treat cellulitis?

Primary-care specialists, including internists and family medicine specialists, treat cellulitis. For patients who seek medical treatment at an urgent-care center or emergency department, emergency-medicine specialists may be the treating physicians. Sometimes infectious-disease specialists or surgeons may be involved in the medical treatment of cellulitis.

How do health care professionals make a diagnosis of cellulitis? What is the medical treatment for cellulitis?

First, it is crucial for the doctor to distinguish whether or not the inflammation is due to an infection. The history and physical exam can provide clues in this regard, as can sometimes an elevated white blood cell count. A culture for bacteria may also be of value in making a diagnosis, but in many cases of cellulitis, the concentration of bacteria may be low and cultures fail to demonstrate the causative organism. In this situation, cellulitis is commonly treated with antibiotics that are designed to eradicate the most likely bacteria to cause the particular form of cellulitis. If an abscess is present, surgical drainage is typically required.

When it is difficult or impossible to distinguish whether or not the symptoms are due to an infection, doctors sometimes treat with antibiotics just to be sure. If the condition does not respond, it may need to be addressed by different methods dealing with types of inflammation that are not infected. For example, if the inflammation is thought to be due to an autoimmune disorder, treatment may be with a corticosteroid.

Antibiotics, such as derivatives of penicillin or other types of antibiotics that are effective against the responsible bacteria, are used to treat cellulitis. If the bacteria turn out to be resistant to the chosen antibiotics, or in patients who are allergic to penicillin, other appropriate antibiotics can be substituted. Sometimes the treatment requires the administration of intravenous antibiotics in a hospital setting, since oral antibiotics may not always provide sufficient penetration of the inflamed tissues to be effective. In certain cases, intravenous antibiotics can be administered at home or at an infusion center.

The following are some examples of antibiotics that have been used to treat cellulitis:

  • Penicillins
  • Amoxicillin
  • Amoxicillin and clavulanate (Augmentin)
  • Ampicillin and sulbactam (Unasyn)
  • Piperacillin and tazobactam (Zosyn)
  • Cefazolin
  • Cephalexin (Keflex)
  • Ceftriaxone (Rocephin)
  • Cefuroxime (Ceftin, Zinacef)
  • Ceftazidime (Fortaz, Tazicef)
  • Azithromycin (Zithromax, Zmax)
  • Erythromycin (Erythrocin, E.E.S., Ery-Tab, EryPed)
  • Imipenem and cilastatin (Primaxin)
  • Levofloxacin (Levaquin)
  • Ciprofloxacin (Cipro)
  • Vancomycin

In all cases, physicians choose a treatment based upon many factors, including the location and extent of the infection, the type of bacteria causing the infection, and the overall health status of the patient.

A mother puts a bandage on the knee of her daughter.

Torn meniscus facts

  • The medial meniscus and the lateral meniscus are two large C-shaped cartilages that are positioned on the top of the tibia bone of the knee.
  • The knee is the largest joint in the body.
  • Cartilage within the knee joint helps protect the joint from the stresses placed on it from walking, running, climbing, and bending.
  • A torn meniscus occurs because of trauma caused by forceful twisting or hyper-flexing of the knee joint.
  • Symptoms of a torn meniscus include knee pain, swelling, popping, and giving way.
  • Treatment of a torn meniscus may include observation and physical therapy with muscle strengthening to stabilize the knee joint. When conservative management is ineffective treatment may include surgery to repair or remove the damaged cartilage.

What is the outlook/prognosis for cellulitis? What are complications of cellulitis?

Cellulitis is a treatable condition, but antibiotic treatment is necessary to eradicate the infection and avoid complications and spread of the infection. Most cellulitis can be effectively treated with oral antibiotics at home. Sometimes hospitalization and intravenous antibiotics are required if oral antibiotics are not effective. Sepsis is a serious complication of cellulitis. If not properly treated, cellulitis can occasionally spread to the bloodstream and cause a serious bacterial infection of the bloodstream that spreads throughout the body (sepsis).

How long does cellulitis last?

Cellulitis may continue to spread and not resolve until antibiotic treatment is used. Typically, the symptoms disappear three to 10 days after you have begun taking antibiotics.

Bacterial Infections 101: Types, Symptoms, and Treatments

Reviewed on 6/12/2017

References

REFERENCE:

Herchline, Thomas E. "Cellulitis." Medscape. Aug. 15, 2016. <http://emedicine.medscape.com/article/214222-overview>.

IMAGES:

1.Bigstock

2.MedicineNet

3.MedicineNet

4.iStock

5.Rafael Lopez

6.iStock, Medscape

7.CDC - Janice Carr

8.BigStock

9.iStock


Source: http://www.medicinenet.com/cellulitis/article.htm


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