Eczema, based on common classifications, includes: 1. Eczema classified by the course of the disease can be divided into acute eczema, subacute eczema, and chronic eczema. 2. Classified by the location of the outbreak, it can be divided into eczema of the scalp, face, nipple, genital area, anal area, hands, and intertriginous eczema, among others. 3. Classified by age, it can be divided into adult eczema, infant eczema, etc. There are also some other classifications: 1. By the characteristics of the rash, it can be divided into erythematous eczema, papular eczema, vesicular eczema, pustular eczema, exudative erosive eczema, and crusty desquamative eczema. 2. By the nature of the cause, it can be divided into bacterial eczema (infectious eczematous dermatitis), fungal eczema, autosensitization eczema, seborrheic eczema (seborrheic dermatitis), dyshidrotic eczema, occupational eczema, atopic eczema (atopic dermatitis), among others.