This is a picture of a typical case of psoriasis, with small lesions on the knuckles. Note the changes in the fingernails.
Update Date 10/18/2013
Updated by: Richard J. Moskowitz, MD, Dermatologist in Private Practice, Mineola, NY. Review provided by VeriMed Healthcare Network. Also reviewed by David Zieve, MD, MHA, Bethanne Black, and the A.D.A.M. Editorial Team.