Quoted from Wikipedia:

"Cellulitis is a diffuse infection of connective tissue with severe inflammation of dermal and subcutaneous layers of the skin. Cellulitis can be caused by normal skin flora or by exogenous bacteria, and often occurs where the skin has previously been broken: cracks in the skin, cuts, blisters, burns, insect bites, surgical wounds, or sites of intravenous catheter insertion."
Source(s):
http://en.wikipedia.org/wiki/Cellulitis

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Cellulitis is the acute inflammation of the connective tissue of the skin, caused as an infection by bacteria.

From http://emedicine.medscape.com/article/781412-overview:
"The word cellulitis literally means inflammation of the cells. It generally indicates an acute spreading infection of the dermis and subcutaneous tissues resulting in pain, erythema, edema, and warmth."

Causes:
Conditions that create breaks in the skin and allow bacteria to enter, such as eczema and severe acne, will put a child at risk for cellulitis. Chickenpox, scratched insect bites, animal bites, and puncture wounds are other causes.

Cellulitis also can form in areas of intact skin, especially in people who have diabetes or who are taking medicines that suppress the immune system.
Source(s):
http://kidshealth.org/parent/infections/skin/cellulitis.html
http://emedicine.medscape.com

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