There are many small holes in front of the soles of the feet, as shown below.

Beriberi (commonly known as beriberi) is caused by fungal infection, and its skin damage often occurs on one side (that is, one foot) first, and it takes weeks or months to infect the opposite side.

Blisters mainly appear on the abdomen and toe side, most commonly between the third and fourth toes, and also on the soles of feet. They are deep small blisters that can gradually merge into large blisters. The skin damage of beriberi has a characteristic, that is, the boundary is clear and can gradually expand outward. Due to the development of the disease or scratching, erosion, exudation, even bacterial infection, pustules and so on may occur.

The cause of disease

Tinea pedis is a foot dermatosis caused by pathogenic fungi, which is contagious. Tinea pedis is common all over the world, especially in tropical and subtropical regions. In China, the incidence of tinea pedis is also quite high.

There is no sebaceous gland between the soles of the feet and toes, so it lacks fatty acids that inhibit filamentous fungi, and its physiological defense function is poor. But these parts are rich in sweat glands and sweat a lot, coupled with poor air circulation and local humidity and warmth, which is conducive to the growth of filamentous fungi. In addition, the cuticle of the sole is thick, and the keratin in the cuticle is a rich nutrient for fungi, which is beneficial to the growth of fungi.

Baidu encyclopedia-tinea of hands and feet