Review Question - QID 210745

A 23-year-old woman presents to her primary care physician for a wellness check-up. She currently does not have any acute complaints besides noticing her “cheeks appear enlarged.” She has noticed that the enlargement is on both sides of the face and is not associated with pain. Medical history is notable for 1 episode of nephrolithiasis that was adequately treated with a nonsteroidal anti-inflammatory drug and hydration. Family history is significant for salivary pleomorphic adenoma in the father and systemic lupus erythematosus in her sister. Her height is 66 in (167.6 cm), weight is 135 lbs (61.2 kg), and body mass index is 21.8 kg/m^2. On physical exam, there is erosion of the enamel of her teeth and skin findings demonstrated in Figure A. She also has bilateral parotid gland enlargement and her cranial nerves are grossly intact. Which of the following is most likely the cause of this patients chief concern?