Nail psoriasis affects up to 55 percent of people with psoriasis and it's tough to treat. Hear why it's difficult to treat and what options are available for managing nail psoriasis from leading dermatologist and NPF Medical Board member, Dr. April Armstrong, Director of the Psoriasis Program, Department of Dermatology at Keck School of Medicine, University of Southern California. This activity is supported by grant funding from AbbVie, Amgen and Lilly.