Final answer:
In impetigo, vesicles coalesce and rupture, leading to encrusted sores on the skin.
Step-by-step explanation:
The vesicles coalesce and subsequently rupture within impetigo, revealing erosions covered by crusts. Impetigo is a common skin infection characterized by the formation of vesicles, pustules, or bullae, which are large, fluid-filled blisters. These lesions tend to rupture, resulting in crusted sores that may be yellowish and can drain exudate. In nonbullous impetigo, these vesicles and pustules rupture and become encrusted sores. On the other hand, bullae formed in bullous impetigo also rupture but result in larger encrusted lesions.