Hello! Thank you for asking on HCM! Regarding your concern, I would explain that this rush could be related to an allergic reaction caused by lisinopril. You should know that all the drugs can potentially cause allergic reactions as an adverse effect. But, it is important excluding other possible causes that may lead to this symptomatology too. I would recommend consulting with your attending physician for a careful physical exam and some tests (complete blood count and inflammation tests for a possible infection). Meanwhile I would recommend stopping lisinopril intake and closely monitoring your blood pressure ( high blood pressure can occur from this change in your therapy). Hope to have been helpful! Kind regards, Dr. Iliri