Sensitive skin (or reactive or hyper-reactive skin) is defined as skin that reacts with redness and/or subjective symptoms (pricking, burning, pain, etc.) to stimuli that are not pathogens in themselves (e.g. wind, heat, cold, water, cosmetics and stress).
A sensitive skin is a thin or a fine-textured skin. It reacts quickly to both heat and cold; therefore, it sunburns and windburns easily. It is commonly dry, delicate and prone to allergic reactions. Temperature changes, some detergents, cosmetics and alcohol (used on the skin) can all cause irritation, leaving the skin red and blotchy, with visible surface veins.