Clear, hard blisters on the feet may be associated with herpes sweat, fungal infections, corns and plantar warts. 1. Sweat herpes: small blisters of the size of a pinpoint to a grain of rice with clear liquid inside, relatively hard to the touch and accompanied by itching symptoms. 2. Fungal infection: If you are infected by fungus, blisters will appear in the toe area, the itching is very intense, the blisters will gradually erode, there is liquid oozing, and infectious. 3. Chicken eye: this is due to long-term friction of the skin, typical symptoms of egg yellow or yellow keratin embolism, the size of a pea, and the surface is smooth, accompanied by pain. 4. metatarsal warts: is caused by human papilloma virus infection, usually in the soles of the feet, for the yellow flat papules or plaques, surface roughness, dermatoscopy can be seen in the center of the lesions of the black hemorrhage points. If the feet long transparent hard bubble, the patient should be timely medical treatment, under the guidance of the doctor to do a systematic examination and diagnosis, so as not to delay the condition.