Plasters are defined as medical technology products and are therefore subject to a specific EU Directive. All products that are released on the market must have undergone a number of tests to show that they are safe to use on skin. If they meet these requirements, they can be labelled “hypoallergenic”. However, this does not guarantee that a small number of individuals can suffer a skin reaction when they use plasters, in the same way that some people are allergic to certain foods. Skin irritations are also often of a purely mechanical nature and arise when the plaster is pulled off and the top layer of skin follows with it.