Derm Dx: Red lesions on the interphalangeal joints of the hands

A 43-year-old white female presents with red lesions on her hands. Her family history is significant for systemic lupus erythematosus in her mother. Physical examination reveals scattered uniformly shaped, flat-topped, violaceous papules on the dorsal surface of the fingers. Both the proximal and distal interphalangeal joints are affected. Examination with a magnifying glass reveals telangiectasia involving the proximal nail fold.