About half of all people experience skin sensitivity.  Sensitive skin is often irritated by elements such as - sun, wind, heat or cold - or by topical products. Other triggers can include hormones, lack of sleep, diet, and air pollution.  See a Dermatologist if you're experiencing pain or stress from irritation.  When trying new skin care products it is best to keep your regimen simple and look for ingredients that are hydrating and soothing.