Final answer:
Chickenpox is a childhood disease caused by the varicella-zoster virus, causing pustular lesions on the body. Shingles is a reactivation of the same virus in adults. Impetigo is a different skin infection that leads to vesicles, pustules, and bullae around the nose and mouth.
Step-by-step explanation:
Chickenpox, also known as varicella, is a common childhood disease caused by the varicella-zoster virus. It is characterized by the formation of pustular lesions on the trunk and other parts of the body (Figure 22.20). The varicella-zoster virus is a member of the herpesvirus family and can also cause shingles in adults after a period of latency (Figure 21.11). Impetigo, on the other hand, is a skin infection caused by another pathogen and it also leads to the formation of vesicles, pustules, and bullae, but typically around the nose and mouth (Figure 21.12).