Hi
Skin rash is a rare side effect of thyroid medication. This may be caused by the
levothyroxine in the tablet or by any of the
ingredients in the tablets like acacia powder, corstarch, lactose, magnesium stearate, gluten and tartrazine or maybe others in various combination. You can take a scratch test or intradermal test for the ingredients of the tablet. In all likelihood, you are allergic to the other components of the tablet besides the hormone.