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Dermoscopy features of melanomas with a diameter up to 5 mm (micromelanomas): A retrospective study To the Editor: Melanomas of \5 mm in diameter (micromelanomas) are often overlooked because they fail to fulfill the D criterion of the ABCD rule.

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Drs Kang and Chung contributed equally to this work.

Funding sources: None. Conflicts of interest: None disclosed.IRB approval status: This project was a quality improvement initiative and thus was not formally supervised by our IRB per their policies.

Background Cutaneous immune-related adverse events (irAEs) represent the most frequent toxicities induced by immune checkpoint inhibitors (ICIs). Objectives To investigate clinical associations of cutaneous toxicities induced by different ICI therapies. Methods This was a multicentre retrospective international cohort study of patients with cancer who developed cutaneous irAEs under ICI therapy. Analysis was performed of the rates and basic characteristics of all cutaneous toxicities, and identification of any associations was performed using univariate and multivariate models. Results In total, 762 patients were included, who developed 993 cutaneous toxicities. Forty different types of skin toxicities were identified. Psoriasis (175 patients, 23Á0%) and pruritus (171 patients, 22Á4%) were the most common toxicities, followed by macular rash (161 patients, 21Á1%) and eczematous-type reactions (150 patients, 19Á7%). Multivariate analysis showed that among