Finger long small blisters is not necessarily AIDS, there may be ringworm, hand, foot and mouth disease, sweat herpes and other diseases. 1. AIDS: is infected with HIV (human immunodeficiency virus) caused by acquired immunodeficiency syndrome, the main manifestations of fever, sore throat, diarrhea and other symptoms, can be long-term, recurrent colds and difficult to heal, only when the invasion to the fingers of the skin, finger blisters, pimples and other manifestations. 2. ringworm: is a filamentous fungal infection caused by ringworm, can be divided into blisters, keratinized type, papules scaly type, etc., which blisters ringworm can be manifested as palms, fingers appear border clear small blisters. 3. Hand, foot and mouth disease: it is a febrile and rash infectious disease caused by enterovirus, which is mainly manifested by the appearance of herpes and small blisters on the hands, feet and mouths, and can be accompanied by fever and fatigue, abdominal pain and diarrhea and other symptoms. 4. Sweat herpes: a blistering skin disease that occurs in the hands and feet, often symmetrical, manifested in the palms of the hands, fingers, accompanied by sudden pain, itching sensation of small blisters. After the finger skin long small blisters, you can go to the hospital for relevant examination, confirm the cause of the disease after the symptomatic treatment.