American Family Physician nail pitting is associated with psoriasis classic sign of iron deficiency http://www.aafp.org/afp/2004/0315/p1417.html http://www.aafp.org/afp/2004/0315/p1417.html American Academy of Family Physicians Am Fam Physician. 2004 Mar 15;69(6):1417-1424. http://www.aafp.org/afp/2004/0315/p1417.html http://www.aafp.org/afp/2004/0315/p1417.html nail pitting is associated with psoriasis Am Fam Physician. 2004 Mar 15;69(6):1417-1424. http://www.aafp.org/afp/2004/0315/p1417.html http://www.aafp.org/afp/2004/0315/p1417.html Dark nails American Academy of Family Physicians