Tips 4 reasons for chapped, cracked and dry lips Cold: the most common cause of dry lips is the rapid change between hot and cold. That’s why we have chapped lips especially in winter. Incorrect care: only in very rare cases are the ingredients of conventional moisturisers suitable for the soft and sensitive skin on our lips. UV-radiation: as lips have almost no pigments, they need to be well protected from exposure to sunlight. Stress: long days at work, along with mental stress, have a negative effect on the condition of our skin. And our lips are no exception.