Which form of impetigo is associated with systemic symptoms such as fever and diarrhea?

Bullous impetigo is the form associated with systemic symptoms such as fever and diarrhea. This type of impetigo is characterized by large, fluid-filled blisters that can produce a more extensive immune response in the body, potentially leading to systemic symptoms. The causative organism, typically Staphylococcus aureus, produces exfoliative toxins that can lead to severe disease manifestations in some patients, particularly children.

In comparison, nonbullous impetigo, the most common form, usually presents with honey-colored crusted lesions and is largely localized without systemic involvement. Acne vulgaris is primarily a condition of the pilosebaceous units and does not lead to systemic symptoms. Ecthyma is a deeper form of impetigo that often affects the dermis and can result in ulcers, but it does not typically present with systemic symptoms like fever and diarrhea to the degree seen with bullous impetigo. Therefore, bullous impetigo is distinct for its ability to elicit a more profound systemic response.