The redness, swelling and pain on the top of the foot are usually caused by trauma, infection on the top of the foot, blood clots and so on. 1. Trauma: the redness, swelling and pain on the top of the foot may be due to the top of the foot by external force or violence, resulting in injury to the top of the foot, the top of the foot of the soft tissues of the inflammatory reaction of hemorrhage and edema, clinically manifested as redness, swelling and pain on the top of the foot. 2. Infection of the surface of the foot: the surface of the foot because of cracked skin or trauma caused by bacterial and fungal infections, local inflammation, the surface of the foot will be red, swollen and painful symptoms. Generally, antibiotics such as cephalosporin can relieve the symptoms. 3. Blood clots: Blood clots in the feet may lead to blood pooling, redness, swelling and even ecchymosis, and blood clogging will cause pain and other discomforts. Depending on the situation, thrombolytic drugs such as warfarin or thrombectomy should be chosen for treatment. In addition, gout and diabetic vascular lesions and other diseases may also cause redness, swelling and pain on the surface of the feet, and it is recommended that patients with this symptom consult a doctor in a timely manner, under the guidance of the doctor for treatment, and avoid self-medication.