A clear hard spot on the finger may be associated with conditions such as herpes sweat, common warts and calluses. 1. Sweat herpes: related to local irritation, infection, allergy and other factors. Sweat herpes tends to grow in the finger area, may exist independently or scattered, accompanied by itching symptoms, manifested as deep blisters. 2. Common warts: caused by human papilloma virus infection, may be manifested as white or gray-white hard spots, belonging to the translucent shape, usually no itching symptoms and pain. 3. callus: may be the finger part of the long-term friction caused by a kind of keratin layer thickening, manifested as yellow or wax yellow plaque, can be translucent or transparent. Finger long a transparent hard spot is also seen in other reasons, patients should go to the dermatology department in time, do a systematic examination, clear cause.