Nails

• Pitting - seen with psoriasis

  
• Half-and-half nails - nails that are white on the upper proximal half and pink on the distal half

  
• Longitudinal ridging - parallel ridges running lengthwise.

  
• Koilonychia - spoon-shaped nails that may be seen with trauma to cuticles or nail folds or in iron deficiency, anemia, or endocrine or cardiac disease

  
• Yellow nail syndrome - grow slow and are curved, may be seen in AIDS and respiratory syndromes

  
• Paronychia - local infection of the nail fold.