A 29-year-old woman has a painful rash on her arm after landscaping. Let’s diagnose.

A 29-year-old woman visited the doctor for a painful rash that developed on her arm 1 day after working on a landscaping project that involved pulling weeds under intense sunlight. On examination, an edematous, pink, scaly plaque and nearby erosions were seen on her right arm. The patient appeared well and had no systemic symptoms.

What’s the diagnosis?

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