SEASONALSKIN CARE

摘要

Skin condition changes with the seasons, yetthe concept of seasonal skin care is still somewhat new to the consumer. The skin is constantly adapting to changes in the external environment that have an impact on skin condition, such as temperature, humidity and solar irradiation. These environmental factors subsequently influence skin biophysical parameters that we can measure (like sebum secretion, transepidermal water loss (TEWL), skin pH) and reflect the integrity and function of the epidermal barrier.The ebb and flow of the seasonal impact on these parameters is also coloured by cyclical monthly hormonal changes and also subtle, daily (circadian) rhythms that differ respective to specific body sites. However, except for sebum excretion which peaks at lunchtime (and women recognise this as the time when their complexion becomes shiny and they need to reapply make-up), the changes in the other parameters are rather small and masked by external and endogenous influences like seasons and stress.