Eczema is a type of eczema that occurs symmetrically on the hands and feet. It is named herpes sweat because it occurs on the hands and feet, where the sweat glands are particularly developed, and because it is mainly characterized by blisters. The clinical manifestations are small, deep blisters, the size of a grain of corn to a grain of rice, slightly above the skin surface, often without redness. It occurs symmetrically on the palmoplantar and lateral side of the fingers (toes). It usually dries up into flakes after 1-2 weeks and can recur with varying degrees of burning and itching. The etiology of herpes perspicans is not well understood, and only a few patients have been found to be associated with mycotic infections elsewhere in the body or metal allergies or even emotional stress. It may be related to mental stress, sweaty hands and feet, fungal infections and allergic reactions, which are common in summer. The main way to prevent sweat rash is to prevent it according to its related characteristics. 1.Emotional control. 2.Do a dietary diary to find out if your sweat rash and metal are related, and if so try to avoid it. 3. During the change of seasons, contact less water and detergents, etc., and apply more moisturizing creams. Treatment: 1. Avoid scratching: scratching is often the main cause of deterioration and complications, so it is quite important to reduce scratching as much as possible. 2, hands and feet maintenance as far as possible hands less contact with water and detergents, etc., feet to keep ventilated and cool. 3, symptomatic treatment such as Chinese medicine wash foam, hormone cream, etc., if necessary, combined with oral medication.