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,