Which statement about smallpox skin lesions is correct?

Which statement about smallpox skin lesions is correct?

• A. Develops asynchronously
• B. Are identical in development
• C. Begin as macules that crust early
• D. They crust before vesicle formation

Answer: (B)

Smallpox lesions evolve in a synchronized fashion. All lesions progress through the same sequence at roughly the same rate, so they are at the same stage of development across the body at any given time. This means you’ll see macules, papules, vesicles, pustules, and crusts all occurring in unison among lesions on the patient. That’s why the statement that lesions are identical in development is the best choice. It captures the coordinated progression that distinguishes smallpox from other varicella-like rashes. Understanding the other options helps reinforce the concept: developing asynchronously is a hallmark of chickenpox, where lesions appear in various stages at once. Beginning as macules that crust early would skip or obscure the expected progression to vesicles and pustules, which isn’t how smallpox lesions behave. Crusting before vesicle formation contradicts the known sequence of lesion evolution, which passes through a vesicle stage before crusting.

Smallpox lesions evolve in a synchronized fashion. All lesions progress through the same sequence at roughly the same rate, so they are at the same stage of development across the body at any given time. This means you’ll see macules, papules, vesicles, pustules, and crusts all occurring in unison among lesions on the patient.

That’s why the statement that lesions are identical in development is the best choice. It captures the coordinated progression that distinguishes smallpox from other varicella-like rashes.

Understanding the other options helps reinforce the concept: developing asynchronously is a hallmark of chickenpox, where lesions appear in various stages at once. Beginning as macules that crust early would skip or obscure the expected progression to vesicles and pustules, which isn’t how smallpox lesions behave. Crusting before vesicle formation contradicts the known sequence of lesion evolution, which passes through a vesicle stage before crusting.