Small granular blisters on the fingers in summer, consider herpes sweat, tinea cruris, eczema, etc., mainly medication and enhanced care. 1. Sweat herpes: sweat herpes is a blistering skin disease that occurs on the hands and feet due to a variety of reasons, usually occurring symmetrically, local application of tretinoin cream, dexamethasone cream, or oral loratadine, cetirizine and other antihistamines, or combined with prednisone, methylprednisolone, and other glucocorticoid drugs for treatment. 2. Ringworm: ringworm is caused by fungal infection, small blisters will appear at the beginning, and then there will be symptoms of flaking, the main use of antifungal drugs, such as applying clotrimazole, ketoconazole, and so on, oral itraconazole, fluconazole when necessary. 3. eczema: eczema begins with papules or blisters on the basis of erythema, if the blisters have a lot of exudation, you can choose boric acid solution, izacrine solution wet compresses, after the skin is dry, apply glucocorticoid drugs, such as tretinoin cream, mometasone furoate cream. In summer, small granular blisters on the fingers, should be for the cause of the symptomatic treatment, the above drugs should be used under the guidance of a doctor, can not blindly use their own.