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Fragrances are complex substances that contain hundreds of different chemicals. Some examples are Balsam of Peru, cinnamic aldehyde, cinnamyl alcohol, hydroxycitronellal, geraniol, isoeugenol, eugenol and oak moss. These chemicals make up the most common causes of ACD to cosmetics. They are also present in many topical preparations, soaps, perfumes, toothpastes and other personal care products. Sensitized patients must use "fragrance free" products. "Unscented" products are not suitable since they may still contain masking fragrances. It is important to note, however, that fragrance free products may contain large quantities of botanical extracts. These extracts are used to improve the odor of the product but can also be a source of sensitizers. It is necessary to perform patch testing with a sufficient number of chemicals to detect a delayed hypersensitivity to fragrances. Once a fragrance allergy is diagnosed, a treatment plan to avoid exposure to culprit fragrances in products should be established.