Inclusion Criteria: - Diagnosis of discoid/subacute cutaneous lupus erythematosus (DLE/SCLE) for at least 3 months prior to screening visit - Meets both clinical and histopathological diagnostic cutaneous lupus erythematosus (CLE) criteria per protocol - Currently receiving treatment for DLE/SCLE with a stable regimen of at least one of the following medications: oral corticosteroid, and/or antimalarial, and/or immunosuppressant - Participant could be with or without concurrent systemic lupus erythematosus (SLE) - If participant receives nonsteroidal anti-inflammatory drugs (NSAIDs) or analgesics treatment then the participant must be on a stable dose 2 weeks prior to screening Exclusion Criteria: - Women who are pregnant, lactating, breastfeeding or planning pregnancy during the study period - Any of the following specific CLE subtypes in isolation: acute cutaneous lupus erythematosus (ACLE), lupus tumidus, lupus (profundus) panniculitis, chilblains - Drug-induced CLE and/or drug-induced systemic lupus erythematosus (SLE) - Antiphospholipid antibody syndrome, serious thrombotic event or unexplained pregnancy loss within 1 year before the screening visit - History of 3 or more unexplained consecutive pregnancy losses - Active severe or unstable neuropsychiatric SLE - Other autoimmune diseases or non-SLE driven inflammatory joint or skin disease or overlap syndromes as primary disease that in the opinion of the investigator will significantly impact the assessment of CLE/SLE disease manifestations and activity Other protocol-defined inclusion/exclusion criteria apply