Psoriasis on the knuckles:

This is a picture of a typical case of psoriasis, with small lesions on the knuckles. Note the changes in the fingernails.
- Reviewed last on: 4/14/2008
- Michael Lehrer, M.D., Department of Dermatology, University of Pennsylvania Medical Center, Philadelphia, PA. Also reviewed by David Zieve, MD, MHA, Medical Director, A.D.A.M., Inc.