Fingernail
Like hair, fingernails never stop growing. They must be cut from time to time. It does not hurt when you cut your nails. The nails are made up of a protein called keratin. Hair and skin also have keratin. Some people paint their nails to make themselves look nicer. Some fingernails can grow into the skin. This is called an ingrowing fingernail. They can hurt, so are often treated through medicine.