A 59-year-old man presents to the nurse practitioner with a poorly demarcated, warm, erythematous area on his lower right leg. It is associated with edema and produces tenderness on palpation. What is the pathogenesis of cellulitis?

Cellulitis most commonly results from infection with group A beta hemolytic Streptococcus.

Cellulitis is the result of obstruction and inflammation of pilosebaceous units.

Sustained inflammation leads to uncontrolled keratinocyte proliferation and dysfunctional differentiation.

The disease can be triggered by psychological factors such as stress, and by exposure to certain environmental substances or allergens.