The authors thank Jack Menke, Sanjay Gajadin, and Marjolein Tasche for their assistance when writing the first version of our review. The authors would also like to thank Adrie Hollestein, Daan Muris, Kazutomo Ohkuma, Tony Ormerod, Jane Sterling, and Hywel Williams for drawing our attention to relevant studies.

Drs. Manchanda, Kazutomo Ohkuma, and Anthony Ormerod kindly provided additional information regarding their studies, and Kate Short and Mohammed Bazza generously sent us their full paper before it was submitted for publication. The editorial base provided help in tracing and translating papers. We also thank Himiko Luiken for translating the unique study on the natural history of molluscum contagiosum by Tsukasa Takemura and colleagues, and Taixiang Wu for interviewing Dr He on details of her study design. We thank Alireza Firooz for assessing the paper by Salmanpour and colleagues, and Susheera Chatpoedprai for providing additional information on their study.

The editorial base would like to thank the following people who were external referees for this review: Anthony Ormerod and Paula Beattie (content experts) and Jack Tweed (Consumer). They would also like to thank Philippa Middleton (Methods Editor) and Jo Leonardi‐Bee (Statistical Editor) for their help with restructuring the review and analysing the data.

We thank Finola Delamere, Philippa Middleton, Tina Leonard, Jo Leonardi‐Bee, Hywel Williams, Jack Gibson, Bob Dellavalle, Alan Arbuckle, Anthony Ormerod, Paula Beatty, and Jack Tweed for their comments on earlier drafts of the review.

For the update of this review the editorial base would like to thank the Key Editor Bob Dellavalle with Alan Arbuckle, Jack Gibson who acted as the statistical referee, Anthony Ormerod who was the clinical content referee, and Jack Tweed the consumer referee.