Fissure (fish Your), Erosion, And Ulcer

A fissure is a thin but deep linear split in the epidermis that extends into the dermis. Severe dry skin can have fissures. An erosion is a depressed lesion that is wider than a fissure but not as deep. An erosion, which is usually moist, may result from a ruptured vesicle or bulla. An ulcer is a deep erosion in which all of the epidermis and part of the dermis are eaten away (eroded). A bed sore is an ulcer. Ulcers often leave scars.