Small itchy rashes on the feet may be caused by contact dermatitis, eczema, athlete’s foot and other causes. 1. Contact dermatitis: If the feet are in contact with allergic or irritating substances, it can cause the body to undergo an abnormal autoimmune response, which may appear as localized erythema, papules and itching. 2. Eczema: related to heredity, allergy and other internal and external factors, can be manifested as erythema, papules, flaking, mossy changes with itching symptoms on the feet. 3. Tinea pedis: superficial fungal infections caused by dermatophytes invading the skin and nails of the feet, which may appear as papules and scales on the feet with itching. It is recommended to go to the hospital in time for the itchy rash on the feet, to clarify the cause of the disease, and to standardize the treatment under the guidance of the doctor, so as not to delay the condition.