Itchy small particles on children’s feet may be caused by contact dermatitis, eczema, papular urticaria and so on. 1. Contact dermatitis: contact dermatitis is considered to be caused by contact with primary irritants and sensitizing substances. Patients will have blisters, papules, papules, itching and other manifestations. If contact dermatitis occurs on the feet of children, there will be small particles of very itchy performance. 2. Eczema: the etiology of eczema is not clear, and is considered to be related to heredity, neuropsychiatric factors, endocrine abnormalities, inhalation, and contact with allergens. Patients will have erythema, papules, itching, blisters and other symptoms. If eczema appears on children’s feet, it can be manifested as itchy small particles. 3. Pimple-like urticaria: Pimple-like urticaria may be caused by mosquitoes, mites, bedbugs and other bites. Patients will appear red papules, blisters, itching and other manifestations. Therefore, children with pimple-like urticaria on the top of the feet will have the symptom of small granules that are very itchy. It is recommended that children with symptoms of itchy feet need to seek timely medical treatment, and the doctor will choose appropriate measures to treat the patient’s condition.