What condition has a parent of a child with varicella reported that indicates they should contact the health provider?

The correct answer indicates a key concern in managing varicella (chickenpox). When all vesicles have crusted over, it signifies the child has moved past the active contagious stage of the illness. Crusting indicates that the virus is in the process of resolving, and typically, children become less contagious once all lesions have scabbed over. Therefore, reporting this condition suggests a positive development in the child’s recovery.

On the other hand, the appearance of new vesicles signals ongoing viral replication, which can perpetuate the contagion and warrant medical advice. Similarly, exhibiting excessive scratching could lead to secondary infections, increasing the need for a health provider's guidance as a precautionary measure. A fever could be a common symptom associated with varicella but does not necessarily indicate a need for immediate contact unless it reaches a concerning level or is accompanied by alarming symptoms. Thus, monitoring the progression of the vesicles and their crusting is crucial in determining when to seek medical intervention.