Final answer:
A fissure is a narrow linear crack in the epidermis exposing the dermis. It can occur due to dry skin, excessive moisture, or fungal infections.
Step-by-step explanation:
The condition described as a narrow linear crack in the epidermis exposing the dermis is known as a fissure. A fissure is a deep linear crack in the skin that can occur due to several factors, such as dry skin, excessive moisture, or fungal infections. It is important to properly care for fissures to prevent infection and promote healing.