Dense small bumps on the top of the foot is very itchy may be tinea pedis, eczema, insect bite dermatitis and other diseases caused by the patient should consult a doctor in a timely manner, to clarify the cause of the treatment. 1. Tinea pedis: if the top of the foot has a dense small bumps itchy, at the same time there is peeling, blisters and other manifestations, should be considered to be a fungal infection caused by tinea pedis, can be used externally ketoconazole and other antifungal drugs for treatment. 2. eczema: if the patient’s feet symmetrically appear dense small bumps, accompanied by erythema, blisters and other polymorphic lesions, may also be caused by eczema, can be used externally with glucocorticoid drugs, such as mometasone furoate gel, halothane ointment, etc. for treatment. 3. Insect bite dermatitis: the top of the foot with a dense pimple is very itchy may also be mosquitoes, bedbugs bite caused by external glycerine lotion, Dinaid ointment, oral loratadine and other drugs for treatment. All of the above drugs should be used under the guidance of a doctor.