The main causes of discomfort for those with very dry and irritated skin are itching and tightness. This dryness can be the result of a genetic predisposition as well as aggravating factors such as water, the use of unsuitable skin care products, the cold, temperature variations and pollution. It is characterised by an altered skin barrier and the proliferation of bacteria which cause irritation and even secondary infections. When attacked, the skin becomes weaker and requires daily treatment.