Fingernail cap edge peeling may be physiological reasons, such as chemical irritation, etc., may also be caused by pathological reasons, such as eczema, ringworm, psoriasis and other diseases. 1. Physiological causes: common such as chemical stimulation, if life often contact with strong alkaline chemical cleaning agents, such as laundry detergent, detergent, etc., stimulate the skin around the nails, can appear in the nail edge flaking, cracking and other symptoms. 2. Pathologic causes: (1) Eczema: the cause of the disease is not yet clear, may be related to genetics, immunity, infection, allergy, etc., the appearance of hand eczema, the patient’s hands may appear red spots, flaking, cracking, blisters and other symptoms, accompanied by pain, itching and so on. The disease is easy to recur, it is recommended that patients go to the hospital in a timely manner, and standardized treatment. (2) ringworm: the patient’s hands are infected by red trichophyton and trichophyton, which can lead to ringworm, mainly occurring in the fingers, palms and lateral edges of the palms. The skin of palms and fingers of patients is hyperkeratotic, and dryness and flaking may appear at the edge of nails, and the deep lines of skin are also prone to cracking, which may also be accompanied by itching and pain. (3) Psoriasis: the cause of this disease is not yet clear, may be related to genetics, immunity, etc., trauma, tobacco and alcohol stimulation, mental tension will aggravate the condition. Patients may have red plaques with scaly flakes on the skin of the hands, and the lesions may rupture and bleed, and the edges of the nails may be flaky and cracked. The skinning of the edges of the fingernail cap may also be caused by other diseases, and it is recommended that the patient go to the regular hospital in time, after a clear diagnosis, standardized treatment under the guidance of the doctor.