iododerma iododerma iododermas are caused by iodides, with the most common sources of exposure being oral and intravenous contrast materials used to treat thyroid disease.: 135 the most common type of eruption is an acneiform eruption with numerous acutely inflamed follicular pustules, each surrounded by a ring of hyperemia.: 135 iododermagranulomatous iododermiaspecialtydermatology