Abstract: 【Abstract】 Adverse skin reactions to cosmetics refer to local lesions or systemic damage involving the skin, mucosa, appendages and other tissues caused by the use of cosmetics. With the increasing variety and widespread use of cosmetics, the incidence of adverse skin reactions have been rising with increasing types of diseases and diverse clinical characteristics. To strengthen the understanding of adverse reactions to cosmetics, the guideline for the diagnosis and treatment of adverse skin reactions to cosmetics （2018 edition） was updated and revised by relevant experts based on literature search and evaluation, discussion, demonstration meetings, opinion solicitation, and other procedures, aiming to standardize clinical diagnosis and treatment of adverse skin reactions to cosmetics, as well as safety monitoring of cosmetics.

Key words: Cosmetics, Skin adverse reactions, Diagnosis, Treatment, Guidelines