Erythema and scaling of the finger and nail bed

A Hispanic man, aged 45 years, presented with changes to the nail and distal fingertip that first appeared two years ago. The man's medical history includes type 2 diabetes mellitus and alcoholic cirrhosis. Review of systems was negative for fever and chills. Erythema and scaling of the distal right third finger, including the nail fold, was noted on physical exam. ...