Nails are covering tips for our fingers. Our nails are made of several layers of a protein called keratin, nails are formed at he edge of the nail under the skin called matrix. New kertain layers is formed and the old layers are pushed out. as they come out they take on the familiar flattened, hardened form of the fingernail. Healthy fingernails are smooth, without pits or grooves. They’re uniform in color and consistency and free of spots or discoloration.