Abstract: 【Abstract】 Dermatitis and eczematous disorders are very common in dermatological clinic. Due to variations in understanding of these diseases, there are some confusions and controversies about the diagnostic terms of "dermatitis" and "eczema" in China and other countries. With the progress in research on dermatitis and eczematous disorders, the understanding of some diseases with unclear causes or etiologies has gradually been improved, and it has been recognized that neither "dermatitis" nor "eczema" should be regarded as an independent clinical diagnostic term. Standardizing the diagnostic process and terminology for related diseases can lay a foundation for better classification, management, epidemiological research, and targeted treatment and prevention of these diseases.

Key words: Dermatitis, Eczema, Diagnosis, International classification of diseases