The top of the foot itches a lot of small particles may be tinea pedis, foot sweat herpes, neurodermatitis and so on. 1. Tinea pedis: blister-type tinea pedis at the onset of the initial manifestation of the toes, the back of the foot, the soles of the foot and other parts of the scattered or clustered small blisters, accompanied by obvious itching, a few days after the blisters can be dried up, appeared to be desquamated. 2. foot herpes sweat: herpes sweat occurs in the hands and feet, foot herpes sweat typical symptoms are small blisters under the skin of the size of a grain of rice or a pinpoint, blisters are easy to rupture, and accompanied by symptoms of excessive sweating of the feet. 3. Neurodermatitis: Neurodermatitis is associated with mental overstress, anxiety and other factors, resulting in a stress response, often manifested in the skin surface of the rice-like size of the pimples, accompanied by paroxysmal itching and other symptoms. Itchy feet with a lot of small particles may also be caused by other reasons, it is recommended that patients go to the hospital in a timely manner. After clarifying the cause of the disease, standardized treatment under the guidance of the doctor.