Contact-allergic reactions to cosmetics may be delayed-type reactions such as allergic and photo-allergic contact dermatitis, and\r\nmore exceptionally also immediate-type reactions, that is, contact urticaria. Fragrances and preservative agents are the most\r\nimportant contact allergens, but reactions also occur to category-specific products such as hair dyes and other hair-care products,\r\nnail cosmetics, sunscreens, as well as to antioxidants, vehicles, emulsifiers, and, in fact, any possible cosmetic ingredient. Patch\r\nand prick testing to detect the respective culprits remains the golden standard for diagnosis, although additional tests might be\r\nuseful as well. Once the specific allergens are identified, the patients should be informed of which products can be safely used in\r\nthe future.
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