Cellulitis results from an infection from a bacteria when it enters the skin through a crack or a cut, according to Healthline. People suffer from cellulitis due to injuries that tear the skin, entry of foreign objects in the skin and bone infections underneath the skin, reports WebMD.
When a bacteria, especially Staphylococcus and Streptococcus bacteria, enter the skin through a cut of a crack in the skin, it can cause a cellulitis infection, explains the Mayo Clinic. Common and severe cases of cellulitis result from a methicillin-resistant Staphylococcus aureus infection caused by a Staphylococcus bacteria.
There are other types of bacteria that cause cellulitis, notes MedicineNet. Children under the age of 6 can get the infection from Haemophilus influenza bacteria that infects the face, upper torso and arms. A dog bite or a cat bite can cause cellulitis through an infection caused by Pasteurella multocida bacteria. Other types of bacteria, such as Aeromonas hydrophila or Vibrio vulnificus bacteria, cause cellulitis when the skin is exposed to sea water or fresh water.
There are certain types of spider and insect bites that accelerate the transmission of the bacteria, causing the infection, says the Mayo Clinic. Some people suffer from cellulitis due to an infection after surgery, expresses WebMD. Long-term skin conditions such as psoriasis and eczema can also cause the infection.