A 7-year-old boy presented with a one-week history of a pruritic rash, which first appeared on his back and continued to spread across his entire body. The patient’s medical history was significant for a scalp lesion (FIGURE 1) that was being treated with oral griseofulvin (started 3 days earlier). He had no history of seasonal allergies, asthma, recent illness, or recent immunizations.
The physical exam was significant for a body-wide, nonerythematous, papular rash (FIGURE 2). There was evidence of excoriation due to itching. No mucosal involvement was appreciated. The remainder of the examination was unremarkable.
Based on the patient’s history and physical exam, which of the following is the most likely diagnosis?
A. Gianotti-Crosti syndrome
B. Atopic dermatitis
C. Dermatophytid reaction
D. Morbilliform drug eruption.
Continue to: THE DIAGNOSIS