Small blisters on the side of the foot is very itchy, may be tinea pedis, sweat herpes and other diseases caused by the patient should consult a doctor in a timely manner, clear the cause of the corresponding treatment. 1. Tinea pedis: itchy small blisters on the side of the foot may be caused by fungal infection caused by tinea pedis, blister type occurs between the toes, foot metatarsal and foot side edge. The lesions are deep in the blisters with the size of a pinpoint, which can be fused into multi-housed blisters, and the itching is obvious. Can follow the doctor’s instructions external ketoconazole, terbinafine and other antifungal drugs for treatment. 2. Sweat herpes: small blisters on the edge of the foot is very itchy may also be caused by sweat herpes, and mental factors, infection, allergies, etc., can appear on the lateral edge of the toes deep in the pinpoint to corn size blisters, self-consciousness of varying degrees of itching or burning sensation. Glucocorticoid drugs can be used externally for treatment. Specifically need to go to the hospital, clear the cause of the disease, follow the doctor’s prescription medication.