Nail extensibility is considered to be related to external force, malnutrition, fungal infection and other factors. 1. External force: Nails subjected to external force, such as smashed or caught in a door, will affect the growth of nails and may lead to nail ectropion. 2. Malnutrition: Frequent partiality, picky eating, anorexia or long-term excessive weight loss are prone to malnutrition, which will have an impact on the growth of nails, leading to nail peeling and ectropion. It is recommended to pay attention to nutritional supplementation, give a variety of fresh vegetables and fruits, meat, eggs, milk, and if necessary, under the guidance of a doctor to supplement trace elements. 3. Fungal infection: Excluding the above factors, can also be considered with fungal infection caused by onychomycosis. Fungus invades the nail plate and nail bed, resulting in changes in the color, texture and shape of the nail, which may lead to nail exfoliation. Fungal microscopy is recommended, and antifungal treatment if necessary. To sum up, there are more reasons leading to nail ectropion, it is recommended to go to the dermatology department of the hospital for examination, if it is caused by pathological factors, it should be standardized under the guidance of the doctor for treatment as early as possible.