Hw to know if back rashes is caused by tapazole (methimazole) or the weather (pollen)?

Runny nose?: I have looked around and it has been difficult to find the typical rash caused by methimazole. I would ask about timing of methimazole to when the rash appeared, if weather, I would expect also runny nose, itchy eyes and maybe sore throat and cough. I can say that medication induced rashes are usually generalized, not only in one area. I would suggest discussing with Endo or Derm. Hope it helps