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Applying white mustard to the skin for an extended period of time can cause burns, blisters, and ulcers.
Special Precautions & Warnings:Pregnancy and breast-feeding: It's UNSAFE to use white mustard in medicinal amounts if you are pregnant. There is some evidence it might start your menstrual period and cause a miscarriage.
There isn't enough information to know whether it's safe to use white mustard in medicinal amounts if you are breast-feeding. Play it safe and stick to food amounts.
Report Problems to the Food and Drug Administration
You are encouraged to report negative side effects of prescription drugs to the FDA. Visit the FDA MedWatch website or call 1-800-FDA-1088.