Sweat vesicles are eczematous changes (allergic dermatitis changes) occurring on the hands or feet, when the patient's palms, palms of the feet, or the sides of the fingers and toes are often very itchy, and there are many small, scattered or nested blisters, some of which are light red papules. Some of these blisters occur rapidly within a few hours, but most of them increase over a few days, and sometimes the nested blisters become large blisters, making it impossible for the patient to use his hands to do anything or walk on his feet.
These blisters are sometimes complicated by bacterial infections, with a purulent reaction. These acute-phase blisters resolve quickly with treatment, but may recur. Usually, the blisters do not break open and will naturally absorb and dry up. After one or two weeks, the blisters will peel off into rounded rounds of dry flaky skin, which will become dry and cracked with a painful sensation, and then return to normal skin. "Vesicular Sweat Rash" occurs in young men and women and in early middle age (20-40 years old), and most of the patients have hyperhidrosis, but the disease is not caused by the blockage of sweat ducts or the swelling of sweat ducts into blisters. The disease tends to flare up every summer or at the change of seasons and lasts for 3-4 weeks at a time. In some patients, it becomes chronic. Some patients are atopic or have nickel allergy. Avoidance of allergens can improve the symptoms, but not completely eradicate them. In some patients, the symptoms worsen with emotional stress and late nights. The true cause of the disease is unknown.