Which term best defines a crusted rupture of pus-filled lesions?

The term that best defines a crusted rupture of pus-filled lesions is impetigo. Impetigo is a highly contagious bacterial skin infection that commonly manifests as red sores or blisters that can ooze and form a yellow crust. The presence of crusted areas indicates that the lesions have ruptured, releasing pus, which then dries and forms a crust. This condition often occurs around the face, especially around the nose and mouth, and can spread easily through direct contact or through shared items.

Understanding impetigo is crucial for recognizing its symptoms and distinguishing it from other types of skin lesions. For instance, while a vesicle refers specifically to a small, fluid-filled sac, it does not typically involve the crusting or rupture associated with impetigo. Cysts, on the other hand, are generally encapsulated collections of tissue that can be filled with fluid or semi-solid material but do not typically present as pus-filled lesions. Similarly, nodules are solid, raised lumps that can be found on the skin but are not defined by the presence of pus or crusting. Thus, impetigo specifically addresses the description of crusted lesions filled with pus, making it the correct choice in this context.