Red lanula (nail)

• reddish lunulae (the nail lunula is often referred to as “moons” of the nail - the lunula is in fact the front end of the matrix) has been reported in association with various conditions:
  • alopecia areata
  • patients on oral prednisone for rheumatoid arthritis
  • collagen vascular disease
  • cardiac failure
  • chronic obstructive pulmonary disease
  • cirrhosis
  • chronic urticaria
  • psoriasis
  • carbon monoxide poisoning

Reference:

1. Zaiac MN, Daniel CR. Nails in systemic disease Dermatologic Therapy 2002;15 (2); 99–106.