Acute eczema is characterized by primary and polymorphic rashes. Often on the basis of erythema, there are needles to miliary papules and papules, and in severe cases, there are small blisters, which often merge into pieces and the boundaries are unclear. At the periphery of the lesion, the above polymorphic rash gradually becomes sparse. Itching is serious, and the rash often forms a rotten surface due to scratching, and there is serous exudation and scab. If accompanied by secondary infection, pustules, pus and pus scabs can be formed, and the corresponding lymph nodes can be swollen. When the infection is serious, it may be accompanied by systemic symptoms such as fever.

The distribution of acute eczema is often symmetrical, which is more common in exposed parts such as face, ears, hands, feet, forearms and calves, and can expand the whole body in severe cases. Self-conscious symptoms include severe itching and burning sensation, which can be suddenly aggravated, especially at night, affecting sleep and work. Some patients first have purulent infection focus of skin injury or insect bite, and bacterial toxins and tissue decomposition products in pus exudate are coated on the surrounding skin, causing erythema, papules, papules, blisters, pustules and other forms of damage around the wound, which gradually expand outward. If not treated in time, erythema, papules and vesicular lesions may appear in the distant parts, accompanied by severe itching, which is called infectious eczema-like dermatitis (infectious eczema-like dermatitis). The course of the disease is usually 1-2 weeks, which can turn into chronic if it is not handled properly or recurs.