Small hard blisters on the top of the fingers are most commonly seen in herpes sweat, tinea cruris, pustular psoriasis and other diseases. It is recommended to clarify the diagnosis first, and then combined with the doctor’s advice to give glucocorticoids, antifungal, immunosuppressive drugs and other treatments. 1. Sweat herpes: Sweat herpes is a blistering skin disease that occurs on the palms of the hands, soles of the feet, fingers, and sides of the toes. It causes localized skin blisters in clusters with pain or itching. Topical tacrolimus ointment and pimecrolimus cream can be used to relieve swelling and irritation of the skin. Tretinoin urea ointment, etc., can accelerate the relief of symptoms. 2. Ringworm: Ringworm is caused by fungal infections, such as blister-type tinea versicolor, which results in hard, small blisters on the hands. Bifonazole cream, miconazole nitrate cream can be given, together with oral terbinafine hydrochloride, itraconazole and other drugs. 3. Pustular psoriasis: Pustular psoriasis is an autoimmune disease that can occur on the hands, also called palmoplantar pustulosis. It can be treated with topical salicylic acid ointment, oral cyclosporine and methotrexate. There may be other reasons for the appearance of hard small blisters on the top of the fingers. Avoid scratching the affected area to avoid inducing infection. You can go to the dermatology department of the hospital for examination, first to clarify the cause, and then standardize the treatment.