I think it can be because it can put a bit of strain on the skin, it doesnt have enough time to calm down.
I've had acne for a really long time, and even though I'm in my late 20's I have to be really carefully about what I eat and drink and my cleansing routine...
What works best for me is:
Drink 2.5 litres of water a day... well try to anyway...
Avoid too much sugar... although sometimes it cannot be helped...
Clean my skin in the morning and at night.
In winter I alternate between a soft milky, moisturising wash (If you have super oily skin it may seem redundent but it you get more pimples if your skin dries out,) and then a harsher micro exfoliating wash like proactive. When it comes to toners and stuff i try not to use it if my skin is too dry...
In summer I wash in the morning and night with proactive...
I think the main thing is using a nice calming moisturiser after every wash (even with oily skin..)I use Simple Moisturiser.
I hope that helps....








