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Unwanted reactions from cosmetic products can vary from mild irritation to severe symptoms. They can appear immediately or after several years' use of a product.
Permanent hairdyes can give the most severe adverse effects, but most reactions come from facial and body moisturisers.
From 2008 to 2014, the National Register for Adverse Effects from Cosmetic Products received 442 notifications, of which 82 per cent were submitted by pharmacists.