What causes blisters on the soles of the feet?

The causes of blisters on the soles of the feet are varied and may result from both non-disease and disease-related factors. Non-disease factors mainly include excessive friction on the foot skin, such as from ill-fitting shoes, prolonged walking, or excessive physical activity, which can cause certain areas of the feet to become compressed, leading to blisters. In addition, insect bites may also cause blisters on the soles of the feet, especially in infants or individuals with thinner, more delicate skin. Disease-related factors are more complex and include skin conditions such as eczema, dyshidrotic eczema, and athlete's foot. Eczema may be triggered in individuals with allergic constitutions after exposure to allergens and typically presents as blisters, small papules, and itching on the skin. Dyshidrotic eczema is a blistering condition that commonly affects the hands and feet and is often caused by exposure to allergens or infection with dermatophyte fungi. Athlete's foot is a fungal infection that causes redness, blisters, and intense itching on the skin of the feet. To ensure accurate diagnosis and appropriate treatment, it is recommended to seek timely medical attention and follow the advice of a qualified physician.