A retrospective analysis based on database was conducted to evaluate the correlation between covid-19 infection and the condition and treatment of psoriasis patients.

Based on the patients registered in the psoriasis patient database of each center, the patients were followed up by telephone, and the severity of covid-19 infection, the change of psoriasis condition and the adjustment of treatment methods of psoriasis patients were collected for retrospective analysis.

Inclusion criteria ----

1. No age limit, both male and female are accepted;
2. Psoriasis patients registered in the database;
3. Patients or their families can cooperate to complete the follow-up information survey (questionnaire, telephone, etc.) independently, and ensure the authenticity of the data provided.

Exclusion criteria ----

Patients are thought having conditions which are not appropriated for attending this clinical trial.

Psoriasis patients registered in the database from January 2018 to November 2022