Melissa Conrad Stöppler, MD, is a U.S. board-certified Anatomic Pathologist with subspecialty training in the fields of Experimental and Molecular Pathology. Dr. Stöppler's educational background includes a BA with Highest Distinction from the University of Virginia and an MD from the University of North Carolina. She completed residency training in Anatomic Pathology at Georgetown University followed by subspecialty fellowship training in molecular diagnostics and experimental pathology.
Dr. Shiel received a Bachelor of Science degree with honors from the University of Notre Dame. There he was involved in research in radiation biology and received the Huisking Scholarship. After graduating from St. Louis University School of Medicine, he completed his Internal Medicine residency and Rheumatology fellowship at the University of California, Irvine. He is board-certified in Internal Medicine and Rheumatology.
Cellulitis is a spreading bacterial infection of the skin and tissues beneath the skin.
Staphylococcus and Streptococcus are the types of bacteria that are usually responsible for cellulitis, although many types of bacteria can cause the condition.
Sometimes cellulitis appears in areas where the skin has broken open, such as the skin near ulcers or surgical wounds.
Cellulitis is not contagious.
Cellulitis is treated with oral or intravenous antibiotics.
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 an 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. 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 people of any age, it is most common in middle-aged and elderly people.
What are cellulitis symptoms and signs?
Cellulitis usually begins as a small area of tenderness, swelling, and redness that spreads to adjacent skin. As this red area begins to enlarge, the
affected person may develop a fever, sometimes with chills and sweats,
tenderness, andswollen lymph nodes ("swollen glands") near the area of infected skin.
Where does cellulitis occur?
Cellulitis may occur anywhere on the body, but 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 (around the eye socket) cellulitis, buccal (cheek) cellulitis,
facial cellulitis, and perianal cellulitis.
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 exhibits
these signs may be developing cellulitis.
Other forms of noninfected inflammation may mimic cellulitis.
People with poor leg circulation, 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.