A 4-year-old boy is brought to the emergency department for a cough. His mother states that he also has had a rash on his buttocks and finger for many weeks. Vital signs are normal except for a temperature of 101.4°F. Physical examination reveals rhinorrhea and approximately 15 small papules clustered together on the buttocks that are identical in size and shape; 1 lesion is also noted on the patient’s middle finger. Results from a chest radiograph and influenza test are negative.

What does the image show? What is the next best step in treatment?

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