A small granular blisters on the finger is considered to be sweat herpes, tinea cruris, etc., and can be treated with topical application of medications and oral medications. 1. Sweat herpes: this is a kind of sweating not benign eczema, blisters are generally the size of a needle tip to rice grains, often accompanied by significant itching. You can use topical glucocorticoid drugs such as mometasone furoate ointment and dianabed ointment. Combined oral antihistamines such as cetirizine, beriberi loratadine, etc., to improve itching. 2. Ringworm: Ringworm may appear as erythema, papules, blisters, scales and other lesions, which require the application of antifungal drugs, such as ketoconazole, miconazole and so on. Fingers with a granular small blisters should be timely to the hospital, clear reasons to give targeted treatment, specific drugs need to follow the doctor’s instructions, not indiscriminate use of drugs.