Iododerma and bromoderma. Iodides and bromides are drugs that can cause severe adverse cutaneous reactions, and of these, the worst are acneiform, furuncular, carbuncular, chancriform, pyodermatous, or granulomatous. Iodides and bromides are widely distributed, not only in foods and in the environment but also in proprietary and formally prescribed medicaments. These figures are of still relatively minor consequences of adverse reactions from the two halides, of which bromides are usually worse than iodides. Lesions like those of acne or folliculitis caused by an iodide are shown.