Blisters means blisters. Blisters on the legs may be caused by diseases such as herpes zoster, contact dermatitis and herpes-like dermatitis. 1. Herpes zoster: This disease is mainly caused by varicella-zoster virus infection, which may be related to factors such as low immunity, mechanical trauma, and excessive mental stress. Herpes zoster can occur in any part of the body, so some patients will have papules and blisters on their legs. 2. contact dermatitis: this disease is caused by skin contact with allergens or irritants, such as pollen, animal dander, clothing materials, soaps, etc. contact dermatitis lesions are mostly confined to the contact area, localized erythema with clear boundaries, blisters and blisters will appear in severe cases, which can be manifested as blisters on the legs. 3. Herpes-like dermatitis: the etiology of the disease is not clear, studies have shown that it may be related to intestinal allergy to gluten food protein, and herpes-like dermatitis has a certain genetic susceptibility. The rash is mainly distributed on the limbs, behind the armpits and shoulder blades, and localized blisters may be present in clusters of aggregates. There are many causes of blisters on the legs, patients need to go to the hospital in time to clarify the specific causes.