The nail plate, commonly called “the nail,” is a platelike keratinous structure, which is exclusively formed by the matrix. It has several functions: it exerts a counterpressure against the upward force of the pulp-thus allowing a fine prehension-and protects the distal phalanx. The nail constitutes a very useful tool, but also is an awesome weapon. It is a very passive structure as its alterations may come from any surrounding structure (matrix, bed, proximal nail fold, etc.) or from any exogenous cause (infection, color, trauma, etc.).