Hard skin around the fingernails may be related to keratosis pilaris, perinail warts, contact dermatitis and other causes, which need to be further differentiated and diagnosed by a doctor. 1. Keratosis pilaris: the skin around the fingernail is infected by fungi, which can cause skin keratinization and peeling. 2. Periungual warts: The skin around the fingernail is infected with human papilloma virus, which can cause keratinization and crusting of the skin. 3. Contact dermatitis: erythema, flaking, itching and other symptoms can occur when localized contact with irritating or allergic substances. It is recommended that people with hard skin around the fingernails go to the hospital in time to clarify the cause, and if treatment is needed, standardized treatment should be carried out under the guidance of the doctor to avoid delaying the condition.