I've been on methimazole for 6 yrs & recently have developed itchy hives on my chest/inner arms/scalp/neck/ears and occasionally back & legs-related?

Maybe. Methimazole is notorious for causing a rash. It is unusual to get a rash after 6 yr, but it is possible. Presumably you have graves disease? Perhaps it is time to reevaluate your hyperthyroidism and think about definitive treatment. See your endocrinologist.

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