What characterizes the lesions of impetigo?

The lesions of impetigo are characterized by the presence of yellowish crusts, which are typically formed as a result of honey-colored exudate that dries and hardens. Impetigo is a common bacterial skin infection, primarily seen in young children, caused by either Staphylococcus aureus or Streptococcus pyogenes. The condition usually begins as reddish sores or blisters that can rupture, ooze fluid, and then develop these crusts. This feature is significant for diagnosis, as the appearance of yellowish crusts is distinctive and helps differentiate impetigo from other skin infections.

In contrast, the other options do not accurately reflect the classic presentation of impetigo. Dark purple spots may suggest conditions like purpura or hemorrhagic lesions, white blisters could indicate a different type of infection or skin condition rather than impetigo, and red rashes are too nonspecific and can be associated with numerous dermatological issues that do not necessarily involve the catastrophic crusting typical of impetigo. Understanding these characteristics is crucial for accurate diagnosis and appropriate treatment in clinical practice.