It isn’t just teenagers who are plagued by zits ­– a huge number of adults are cursed with problematic skin.  Adult acne is increasing and a recent study in the US shows that 25 per cent of women aged 30-40 will suffer from the condition.

Stress is a major cause of the spot epidemic.  Acne is caused by hormonal changes normally onset by puberty but it’s now seen in adults who lead more stressful lives.

Stress stimulates the production of male hormones. The major culprit is dihydrotestosterone (DHT), which increases the production of the skin’s natural oil, sebum, clogging the pores.  The bacteria associated causes acne to thrive in these conditions, feeding on the sebum and irritating the glands, which leads to spots.