The climate (where you live or vacation) influences your skin’s moisture levels. Humidity levels influence skin’s water or moisture content, which influences the skin’s reactions to stripping agents. The higher the humidity level in the air, the better your skin can tolerate dehydrating products. The drier the climate, the less your skin will tolerate multiple stripping agents. Heat triggers oil production. In hotter climates and in summer months, people tend to have more oily skin. In colder climates and winter months, skin tends to become drier. Turning on your heater at home, at work or in your car reduces moisture levels in the air, and, therefore, in your skin too. This is why there can’t be a cookie cutter, one-size-fits-all approach to an acne skin-care regimen. One thing I recommend is putting a humidifier in your bedroom during winter months and in drier climates.