Red bumps on hands

A 29-year-old woman complaining of an asymptomatic eruption on her right arm. She noted that the first lesion appeared 7 days after her cat had scratched her right arm. She has no significant medical history and her temperature is 36.7 C (98 F), blood pressure is 120/74 mm Hg, and pulse is 60/min. Over the next several weeks, more lesions developed proximally, as shown in the image below.

Based on the patient’s history and skin examination, which of the following is the best diagnosis?

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