People typically have a half-moon shape, or lunula, on their nails. This appearance may be less visible in people with certain conditions. ... Some people with Wilson disease develop blue lunulae.

It’s known to cause blue lunulae. Severe renal disease. The portion of your nail containing the lunula may turn white, sometimes creating a nail that’s half-brown and half-white.

If the lunula is absent, consider anemia or malnutrition (Figure 16). A pyramidal lunula might indicate excessive manicure or trauma (Figure 17). A pale blue lunula suggests diabetes mellitus. If ...

A blue lunula can indicate respiratory problems, heart disease, or poor circulation. WHITE SPOTS White spots on the lunula can indicate a zinc deficiency, anaemia, or liver disease.

Learn what might cause your toenails to turn blue, including argyria, cyanosis, Raynaud’s phenomenon, Wilson’s disease, and blue nevus. We'll also cover treatment options for these conditions ...

Lunula cover the bottom of the nail, just above the cuticle. Lunula are part of the nail matrix and the matrix refers to the tissue just beneath the nail. It contains nerves, lymph and blood vessels.