Without the protection of socks, the result of frequent 'intimate contact' between feet and shoes is that it is easy to make the cuticle of the heel and other parts that often contact with shoes grow thicker, and the instep, toe and other parts that rub with shoes are prone to skin redness, papules, blisters and other symptoms. This is because the skin is allergic to leather, rubber and other materials of shoes, belonging to contact dermatitis.
In addition, the fat layer of the foot is thin, the heat preservation is poor, the farthest from the heart, and the blood supply is poor, so the skin temperature of the sole of the foot is the lowest, and it is extremely vulnerable to cold. Once the foot gets cold, it can reflexively cause the capillary contraction of the upper respiratory tract mucosa, so that the resistance is significantly reduced, the bacteria in the air will take advantage of the opportunity to cause a variety of diseases such as heat, cold and so on. Especially when it rains, barefoot is more likely to get cold, which can cause stomach pain, waist and leg pain.