Cracks on the body may be caused by environmental factors that dry out the skin, skin allergies, and ichthyosis. 1. If cracked skin often occurs in spring or winter, it is usually caused by environmental factors. As the temperature drops quickly in winter and spring, the climate is drier than other seasons, which may cause a lack of moisture in the skin, resulting in cracks in the skin. 2. If you are allergic and come into contact with allergy-prone substances or use poor-quality cosmetics, it may cause adverse stimulation to the skin, resulting in skin allergies and cracking. 3. Ichthyosis is a family hereditary skin disease, autosomal dominant inheritance, usually the symptoms of the skin will be similar to the fish scale scales, sometimes the edge of the scales part of the slight upward, it looks like the skin cracks. Cracks on the body, it is recommended to go to the hospital in a timely manner, to clarify the cause of the disease, and then follow the doctor’s instructions for targeted treatment.