Discolored fingernails can be caused by nail polish, but yellow nails can also indicate Psoriasis or Fungal Nail Infections. Brown nails can be a sign of Thyroid Disease or Malnutrition. White Nails can be an indication of Iron Deficiency. And blue-gray fingernails can show you arenâ€™t getting enough oxygen!
Excessively Curved Nails
These excessively curved nails (orÂ Pincer Nail Deformity) are caused byÂ Kawasaki Disease, Psoriasis, Cancer, SLE and End-Stage Renal Disease.