Small blisters generally refers to small blisters, feet with small blisters rotten feet considered to be tinea pedis, contact dermatitis, eczema and other diseases, patients need to take medication for the cause. 1. Tinea pedis: small blisters on feet may be caused by tinea pedis, patients need to use antifungal drugs under the guidance of a doctor, such as miconazole, econazole, ketoconazole, or oral antifungal drugs, such as terbinafine, bupropion and so on. 2. Contact dermatitis: feet with small blisters rotten feet may also be caused by contact dermatitis, patients can be under the guidance of the doctor external glucocorticoid drugs, such as dinexed, halomethasone, etc., or oral antihistamines, such as chlortetracycline, cetirizine, etc., to avoid contact with allergenic substances. 3. Eczema: feet with small blisters rotten feet is also considered to be caused by eczema, patients follow the doctor’s instructions for external use of dexamethasone, trimethoprim, mometasone furoate and other glucocorticosteroids, or oral antihistamines, such as ibuprofen, azelastine and so on. There are many reasons that lead to small blisters on the feet rotten feet, patients can identify the cause of the disease, and take relevant treatment measures.