They may be caused by bacteria, fungi, or viruses. Structural abnormalities of the nail or nail loss may result. White nail syndrome may also be called leukonychia. Leukonychia can occur with arsenic poisoning, heart disease, renal failure, pneumonia, or hypoalbuminuria. Yellow nail syndrome is most commonly associated with lung disorders, and with lymphedema.
Periungual warts are common warts.
They are located around the fingernails and may grow under the fingernails. Periungual warts are difficult to treat. Multiple treatments are available but failure rates are high. This is an unusually severe case. Internal diseases and nutritional deficits can cause changes in the appearance of the nails.