A 51-year-old woman visited her primary care doctor complaining of a rash, pruritus, myalgias, and muscle weakness that made normally easy tasks like standing from a seated position difficult. The rash was an erythematous blanching patch spread across her chest in a V shape. She had also noticed that her finger nail folds were red and swollen.
Could it be systemic lupus erythematosus? Polymorphous light eruption? Allergic contact dermatitis? Dermatomyositis?
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