Fingernails: What’s normal, what’s not
Your fingernails — composed of laminated layers of a protein called keratin — grow from the area at the base of the nail under your cuticle. Healthy fingernails are smooth, without pits or grooves. They’re uniform in color and consistency and free of spots or discoloration.
Sometimes fingernails develop harmless vertical ridges that run from the cuticle to the tip of the nail. Vertical ridges tend to become more prominent with age. Fingernails can also develop white lines or spots due to injury, but these eventually grow out with the nail.