Red blisters on feet are considered to be blood blisters or blisters, which may be related to excessive friction, traumatic collision, fungal infection, palmoplantar pustulosis, hand, foot and mouth disease and other conditions. 1. Excessive friction: if the patient wears shoes that are too tight, or shoes that are cheap, it may lead to repeated friction between the skin of the feet and the shoes, and blisters or blood blisters may appear in serious cases, accompanied by obvious pain. 2. Traumatic collision: If the feet are hit or crushed by external forces, the capillaries under the skin will be ruptured, causing subcutaneous hemorrhage, and blood blisters may also be formed. 3. Fungal infection: If the patient’s feet have fungal infection, tinea pedis will be formed. Typical symptoms are itchy skin on the feet, small blisters or small blood blisters on the skin, and repeated scratching of the skin in the area, which can also lead to skin breakage, vesicles and oozing. 4. Palmoplantar pustulosis: in the patient’s palms or soles of the feet, there will be repeated batches of pustules, accompanied by itching, erythema, pain and other symptoms. 5. Hand, foot and mouth disease: typically characterized by the appearance of a rash or herpes in or on the mouth, hands or feet. If red blisters on the feet, patients should go to the dermatologist in time, actively cooperate with the doctor to do a systematic examination, a clear diagnosis.