This is a picture of a typical case of psoriasis, with small lesions on the knuckles. Note the changes in the fingernails.
Review Date 8/14/2020
Updated by: Elika Hoss, MD, Senior Associate Consultant, Mayo Clinic, Scottsdale, AZ. Also reviewed by David Zieve, MD, MHA, Medical Director, Brenda Conaway, Editorial Director, and the A.D.A.M. Editorial team.