A School-Age Child Has a Rash Without Fever or Preceding

A school-age child has a rash without fever or preceding symptoms. Physical examination reveals a 3-cm ovoid, erythematous lesion on the trunk with a finely scaled elevated border, along with generalized macular, ovoid lesions appearing in a "Christmas tree" pattern on the child's back. What is the initial action?

A) Obtain a KOH preparation of a skin scraping to verify the diagnosis.
B) Prescribe topical steroid creams to shorten the course of the disease.
C) Reassure the child's parents that the rash is benign and self-limited.
D) Recommend topical antihistamines and emollients to control the spread.