What symptom is commonly associated with Impetigo?

Impetigo is a highly contagious skin condition commonly seen in children but can affect anyone. The characteristic symptom associated with impetigo is the formation of small blisters that eventually break, ooze, and then form a yellow-brown crust, which is a hallmark of this infection. This progression from blisters to crusting is what makes option B the correct choice.

Other symptoms, while they may be present in other skin conditions, do not specifically denote impetigo. For instance, a red, itchy rash can be associated with various dermatological issues but does not specifically indicate impetigo. Similarly, dark pigmentation changes could be seen in conditions related to hyperpigmentation but are not diagnostic of impetigo. Painful swelling could occur due to inflammation from many skin infections or conditions but isn't typical of impetigo's presentation. Thus, the fluid-filled blisters that lead to crust formation are distinctive to impetigo, confirming option B as the right answer.