Change in the structure of the nail plate. Typical demonstrations are quite diverse. In general, it is very similar to the nail fungus. At the first demonstrations, the nail plate resembles a thimble. On the whole surface, it is observing bulged-in spots and furrows. They can occur immediately on all nails, or only hit one. In the beginning, changes are observed at the edge of the nail. Then spots and furrows gradually move to the root and change its color starts. The nail becomes dim and thickened. Further impairment of blood circulation only aggravates symptoms.