What is the fold of skin at the sides of the nail called?

The fold of skin at the sides of the nail is referred to as the perionychium. This term specifically describes the area that encompasses the sides of the nail plate, providing protection to both the nail and the underlying nail bed. It plays a crucial role in maintaining the health of the nail and can be important in preventing infections.

The cuticle, while related to the nail, specifically refers to the layer of dead skin that overlaps the base of the nail plate and protects the area between the nail and the skin from infection. The free edge is the part of the nail that extends beyond the finger and does not have skin at its sides. Acrylic refers to a type of nail enhancement product used in nail services and does not relate to the anatomy of the nail itself.