Small blisters on the feet in summer can be treated with antifungal drugs if they are caused by tinea pedis, or with glucocorticoid drugs if they are caused by herpes sweat. 1. Tinea pedis: If there are small blisters on the feet, they may be caused by fungal infections, and there will also be impregnated vesicles between the toes, itching and peeling, etc. The symptoms of tinea pedis can be treated with antifungal drugs, such as ketoconazole cream. You can use antifungal drugs for treatment, such as ketoconazole cream, terbinafine cream and so on. 2. Sweat herpes: blisters on the feet in the summer may also be caused by sweat herpes, accompanied by significant itching, can be treated with glucocorticoid drugs, such as topical halometasone ointment, dexamethasone ointment. It can be treated with a combination of oral antihistamines such as cetirizine. If there are blisters on the feet, you should go to the hospital in time for treatment, and you should follow the doctor’s instructions when using the above drugs.