[Fatal epidermal necrosis due to methotrexate use].

A 53-year-old patient with known psoriasis presented with painful erosive plaques in existing psoriasis lesions, ulcerations in the mouth, and leukopenia. She used 10 mg of methotrexate daily without folic acid prophylaxis. During admission she developed pancytopenia, liver failure and acute kidney injury. She died after developing toxic shock syndrome. We aim to describe the use and toxic effects of methotrexate, how to recognise toxicity clinically and histologically, and treatment options.