Dermatologists say there is a steady increase in the number of adult acne patients they see. Why, oh why, is this happening? It's down to those pesky hormones again. One cause of adult acne, it's believed, is chronic stress, which causes the ongoing release of cortisol into the body. This stimulates the production of androgens - the so-called male hormone testoserone. [A little bio lesson: women and men both produce oestrogen, progesterone and testosterone.] In women, testosterone causes an increased production of sebum which, in turn, causes acne.
Then there are the hard, red, painful eyesores that erupt on our chin (and/or neck and back) just before we get our period. That's because our oestrogen levels plummet in this, er, period, while our testosterone levels remain the same, and hey presto... there it is!
We can aggravate our problems
by not cleaning our skin properly, using dirty make-up brushes, not cleaning our cellphone regularly, etc., which transfer acne-causing bacteria to our faces.
Related: All About Acne: Myths, Facts and Best Advice
But wait! There's more!
There is also the still-controversial, but increasingly accepted, theory about our diet causing zits. Once upon a time, we believed that zits were caused by eating junk food, then a study was done which concluded that there was no connection between what we eat and pimples. Now it appears they may have got it wrong...