Blisters on the feet in summer may be caused by fungal infections, excessive friction, eczema and other conditions. 1. Fungal infection: If the feet are infected by fungus, it will lead to tiny blisters or pimples in the middle of the toe crevices, accompanied by intense itching, and if the blisters rupture, there will be liquid outflow. If the blisters break, fluid will flow out. If you don’t pay attention to change shoes and socks in time in summer, or the shoes and socks are not breathable, the itching will be aggravated. 2. Excessive friction: If the material of shoes is too hard, repeated friction on the local skin can lead to skin damage and blisters. 3. Eczema: summer heat, if the foot environment is too humid and stuffy, may induce eczema, the typical symptoms of feet appear reddish pimples or mounds of herpes, with intense itching, covered with yellow crusts. Because of the many causes of this symptom, it is best to consult a doctor in time, do a systematic examination to make a clear diagnosis and active treatment, so as to avoid delaying the condition.