Cellulitis is an infection of the skin and deep underlying tissues. Erysipelas is an infection of the outermost layers of the skin.
Group A strep (GAS) and staphylococcus aureus bacteria are the most common causes of cellulitis and erysipelas.
Both cellulitis and erysipelas begin with a minor incident, such as a bruise. They can also begin at the site of a burn, surgical cut, or wound, and usually affect your arm or leg.
When the rash appears on your trunk, arms, or legs, however, it is usually at the site of a surgical cut or wound.
Even if you have no symptoms, you carry the germs on your skin or in your nasal passages and can transmit the disease to others.
Symptoms of cellulitis include:
Symptoms of erysipelas include:
In addition, the infection may come back, causing chronic (long-term) swelling of your arms or legs (lymphedema).
Your doctor may take a sample or culture from your skin lesions to identify the bacteria causing the infection. He or she may also identify the bacteria by running a blood test.
In most cases, your doctor will prescribe antibiotics to be taken by mouth. In severe cases, your doctor may recommend that you be hospitalized to receive intravenous antibiotics
Reference: The National Institute of Allergy and Infectious Diseases