People who are obese or people with weakened immune systems are more likely to develop cellulitis, according to Mayo Clinic. Other risk factors include injury a specific area of the body, a history of using intravenous drugs or a history of swelling in the arms and legs.
Cellulitis usually occurs when bacteria, typically streptococcus or staphylococcus, enters the body through a break or crack in the skin, states Mayo Clinic; however, spider and insect bites have been known to cause the infection as well. Although it can occur anywhere, the most common places infected are the lower legs. Treatment usually involves antibiotics if the infection is mild, according to WebMD. For severe infections, intravenous antibiotics are usually needed.