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A 66-year-old man presented to the outpatient dermatology clinic with a chief complaint of a pruritic rash on his upper trunk and proximal upper extremities, which had been present for three weeks. Upon examination, he was found to have an erythematous, annular, and polycyclic eruption on the chest, upper back, and proximal extremities. A clinical diagnosis of subacute cutaneous lupus erythematosus (SCLE) was made. The patient was found to have a positive anti-nuclear antibody (ANA) in a speckled pattern and a positive anti-Ro antibody. A biopsy revealed an interface and lichenoid dermatitis with dermal mucin deposition, consistent with subacute cutaneous lupus erythematosus. The patient reported that he had recently been diagnosed with hypertension and began treatment with olmesartan, a potassium-sparing diuretic that blocks the angiotensin II receptor, commonly used as an antihypertensive or in patients with heart failure. Cutaneous reactions to olmesartan are rare and reported in

Drug-induced lupus (DIL) is an autoimmune phenomenon that has similar clinical and laboratory manifestations with idiopathic systemic lupus erythematosus (SLE). About 100 drugs are now known to be associated with the development of DIL. Its diagnosis is verified in the presence of a chronological relationship between the long-term administration of drugs and the mandatory presence of one clinical and one laboratory diagnostic criteria for SLE.The paper deals with the etiology, pathogenesis, and differential diagnosis of DIL. It presents a spectrum of drugs that can cause DIL and considers the features of its different forms.Based on the recent data available in the literature, the authors analyze the occurrence of autoimmune responses due to the useof biologic agents (BAs), primarily tumor necrosis factor-αinhibitors. Therapeutic approaches for DIL are discussed. Recommendations are given for screening the patients in the use of BAs. Clinical examples are provided.