The possible causes of cracked and layered toenails include malnutrition, perinail eczema, onychomycosis, and infection by external substances.
1. Malnutrition: toenails need enough nutrition to grow well, when patients lack vitamins and trace elements, it may affect the growth of toenails, and cracking and layering of toenails will occur.
2. Periungual eczema: Periungual eczema may affect the nail matrix cells at the root of the toenail, leading to abnormalities in the nail plate, and thus the symptoms of cracking and layering of the toenail appear.
3. Onychomycosis: the toenail is infected by fungus, which may destroy the nail bed, leading to split and layered toenails.
4. Infection by external substances: If the toenail is accidentally contaminated with chemicals, such as nail polish, it may cause lesions in the structure of the nail plate, which may cause the toenail to thicken and lead to cracking and layering of the toenail.
Toenail cracking and layering, it is recommended to go to the hospital in time, clear cause of the disease under the guidance of the doctor for treatment.