Dermatology Q13

A 62-year-old woman is evaluated for a “sun allergy,” manifesting as a rash on her scalp, eyelids, upper back, and knuckles. This started 2 years ago, but is less pronounced over the winter months. Medical history is unremarkable. Her only medication is hydrocortisone cream.

On physical examination, vital signs are normal. Pink-violet edematous macules are present on the eyelids. The scalp has pink-violet diffuse scaly macules with some thinning of the hair. There is a poikilodermatous pink scaly plaque on the upper back and posterior neck. The metacarpophalangeal and proximal interphalangeal joints have pink-violet flat-topped papules on their dorsal surface. There are dilated periungual capillary loops on each finger, and all 10 cuticles are dystrophic. There are no swollen joints, no abnormalities on strength testing, and no oral ulcerations.

Laboratory studies show antinuclear antibody titer of 1:640. All other laboratory values including creatine kinase, aldolase, aspartate aminotransferase, and gamma-glutamyl transferase, are normal.

Which of the following is the most likely diagnosis?

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