What is a potential complication of untreated cellulitis?

Untreated cellulitis can lead to a potentially life-threatening condition known as sepsis. This occurs when the body has a severe response to an infection, where the inflammatory response becomes widespread, leading to systemic inflammation, multi-organ failure, and can ultimately result in death if not promptly treated. The bacteria that cause cellulitis can enter the bloodstream, and this systemic infection can spread rapidly.

In contrast, the other options do not relate directly to the progression of untreated cellulitis. Skin cancer is unrelated to bacterial infections like cellulitis. Impetigo is a different bacterial skin infection and is not a complication of cellulitis, while contact dermatitis represents a skin reaction often due to allergens or irritants, which also does not connect to untreated cellulitis. The significant risk of sepsis underscores the importance of treating cellulitis early and effectively to prevent complications.