Inclusion Criteria:  Patients who have obtained written consent from their legally acceptable representative to cooperate in this survey before the start of treatment with this drug Patients aged less than 18 years at the start of treatment with this drug Patients newly treated with this drug for any of the following diseases: Psoriasis vulgaris, psoriatic arthritis, pustular psoriasis  Exclusion Criteria:  Prior treatment with this drug Participation in an interventional study (e.g., a clinical trial) at the time of starting this drug.