A 25-year-old man with a history of rheumatoid arthritis currently taking oral methotrexate 25 mg per week presented with a lesion of the left bulbar conjunctiva of about 1 month’s duration. The lesion measured 6.5 × 2.5 mm and was firm, nonvascular, slightly mobile, and located on the superotemporal portion of the bulbar conjunctiva. What would you do next?