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Detergent substances (for example, in soaps or shampoos) lead to a washing away of the fat from the skin. Through the washing away of fat, the skin barrier and thus the protective function can be damaged. Dry, raw skin is already a first sign of a degraded skin barrier. Then, allergy-causing substances, such as those in hair colourings, shampoos or permanent-wave liquid, can penetrate your skin more easily and initiate an allergic skin reaction. Whether, and when, the allergy appears varies with the individual and cannot be predicted.
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