Social stigma in the context of health is the negative association between a person or group of people who share certain characteristics and a specific disease. In an outbreak, this may mean people are labeled, stereotyped, discriminated against, treated separately, and/or experience loss of status because of a perceived link with a disease. The current COVID-19 outbreak has provoked social stigma and discriminatory behaviours against people of certain ethnic backgrounds as well as anyone perceived to have been in contact with the virus.
This checklist put together by the WHO, IFRCm UNICEF and WHO contains recommendations from the John Hopkins Center and gives in 5 pages a handy overview over the issue.