How would you manage a case of subcutaneous panniculitis-like T cell lymphoma (A/B) who is already on steroids and methotrexate for autoimmune disease?

First, I would want to be assured that the diagnosis is truly panniculitis T cell lymphoma and not lupus profundus. The two can be hard to differentiate microscopically with T cell gene rearrangement positive in the lymphoma. If the diagnosis is lupus profundus, this would be managed as per rheumato...